1. In Islam the festivals are clearly established and there is no place for innovations and imitation of kuffar. Our festivals are part of our worship and anything that contradicts it can never be a part of Islam.
Ibn Taymiyyah, may Allah have mercy on him, said: "Festivals are part of the laws, clear way and religious ceremonies of which Allah Says (what means): 'To each among you, We have prescribed a law and a clear way' [Quran 5:48] and 'For every nation We have ordained religious ceremonies which they must follow.'" [Quran 22:67]
Festivals distinguish religions and celebrate a festival of another religion is agreeing to their disbelief.
Undoubtedly, going along with them in their festivals may, in some cases, lead to disbelief. Dabbling in these things, at the very least, is a sin. The Prophet (peace be upon him)referred to the fact that every nation has its own festivals when he said: "Every nation has its own ‘Eed and this is our ‘Eed." [Al-Bukhari]
Valentine's day does not belong to Islam. It is exclusive to kuffar and a Muslim must not follow it. If the Christians have a festival and the Jews have a festival, which belongs exclusively to them, then no Muslim should join in with them, just as he does not share their religion or their direction of prayer.
2. Celebrating this day means to imitate the pagan Romans. Then Christians imitated them as valentines day was not even in their religion. This was something that idolators invented and we as believers must not practice it and fall into kufr.
Imitating non-Muslims in general -whether they are idolaters or People of the Book - is Haraam (prohibited), whether that imitation is of their worship - which is the most serious form - or of their customs and behavior. This is indicated by the Quran, Sunnah and Ijmaa' (unanimous consensus of scholars):
(i) From the Quran: Allah Says (what means): "And be not as those who divided and differed among themselves after the clear proofs had come to them. It is they for whom there is an awful torment." [Quran 3:105]
(ii) From the Sunnah: the Prophet said: "Whoever imitates a people is one of them." [Abu Dawood]
Ibn Taymiyyah, may Allah have mercy on him, said: "This Hadeeth (narration) at the very least indicates that it is Haraam to imitate them, although the apparent meaning implies that the one who imitates them is non-Muslim, as Allah Says (what means): 'And if any amongst you takes them friends (and helpers), then surely, he is one of them' [Quran 5:5].”
(iii) With regard to Ijmaa', Ibn Taymiyyah, may Allah have mercy upon, him narrated that there was agreement that it is Haraam to imitate non-Muslims in their festivals at the time of the Prophet’s Companions, may Allah be pleased with them, and Ibn Al-Qayyim narrated that there was scholarly consensus on this point.
3.It spreads and promotes immorality in society. The love referred to in this festival is the romantic love outside of wedlock. Celebrating it means that we approve of the evil and corruption and deem them right. It also means that the law of Allah stands nothing in front of such festivals. May Allah protect us.
The result of that is the spread of fornication and immorality. Hence, the Christian clergy opposed it at some stage and abolished it, then it came back again.
Some people may wonder, and say: “You mean to deprive us of love, but in this day and age we express our feelings and emotions - what is so wrong with that?”
Firstly: The love referred to on this day is romantic love, taking mistresses and lovers, boyfriends and girlfriends. It is known to be a day of promiscuity and sex for them, with no restraints or restrictions… They are not talking of pure love. This festival for them is a means for everyone to express love.
Secondly: Expression of feelings and emotions is not a justification for the Muslim to allocate a day for celebration.
In Islam, a husband loves his wife throughout the year, and he expresses that love towards her with gifts, in verse and in prose, in letters and in other ways, throughout the years - not just on one day of the year.
Thirdly: There is no religion which encourages its followers to love and care for one another more than Islam does. This applies at all times and in all circumstances, not just on one particular day. The Prophet
said: "If a man loves his brother, let him tell him that he loves him." [Abu Dawood]
And He said: "By the One in Whose hand is my soul, you will not enter Paradise until you truly believe, and you will not truly believe until you love one another. Shall I not tell you of something that, if you do it, you will love one another? Spread salaam (Islamic greeting) amongst yourselves." [Muslim]
Fourthly: Love in Islam is more general and more comprehensive; it is not restricted only to one kind of love, that between a man and a woman. There are many more kinds of love. There is the love of Allah, love of His Messenger and his companions may Allah be pleased with them, love for good and righteous people, love and support for the religion, love of martyrdom for the sake of Allah, etc.
Fifthly: What these people think, that love before marriage is a good thing, is wrong, as has been proven in studies and by real-life experience.
So, how can we believe that Valentine's Day is of any benefit to Muslims? The truth is that it is a call for more permissiveness and immorality, and the forming of forbidden relationships.
And Allah knows best.