Supplicating Allah to marry certain woman in Paradise
23-2-2017 | IslamWeb
Question:
Respected Shaykh, assalaamu alaykum wa rahmatullaahi wa barakaatuhu. I wish to marry a woman as per the Sharia when she becomes available. I am not sure if I will ever be able to marry her in this world. Hence, I always pray to Allaah that He grants my wish of making her my wife in Paradise. My question is: can I give almsgiving on her behalf so that Allaah would increase her grade in Paradise. May Allaah reward you for your guidance.
Answer:
All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
Marriage is the best advice for a man who loves a woman. Ibn ‘Abbaas 
narrated that the Prophet, sallallahu ‘alayhi wa sallam, said, "There is nothing like marriage for two who love each other." [Ibn Maajah]
If this woman has reached puberty or became available for marriage and she is religious and well-mannered, then you should propose to her family. The woman will be with her husband in Paradise. If a man other than you marries her, then she shall be his wife in Paradise (Allah willing).
Ibn Hajar Al-Haythami 
wrote, "A woman will be for her husband to whom she was married when she died, contrary to the woman who died while unmarried." [Az-Zawaajir] If a woman died while unmarried in this worldly life, then Allah, The Almighty, will wed her to whomever He wills, as there will be no unmarried people in Paradise.
There is no harm in supplicating Allah to make her your wife in this worldly life so that she would be your wife in Paradise. However, you should not supplicate Allah to make her your wife in Paradise only, because this may involve an impermissible meaning, which is that she would remain without a husband. Marriage is one of the good deeds encouraged by the Sharia given the great benefits that it yields in this worldly life and the Hereafter.
As for offering charity on her behalf, the basic principle is that there is no harm in doing so. Haashiyat Ibn Qaasim ‘ala Ar-Rawdh Al-Murbi‘ reads:
"Ibn Al-Qayyim said, 'It is allowable to dedicate the rewards of fasting, prayer, or charity to another, to the dead or the living, and, according to Ahlus-Sunnah Wal-Jamaa‘ah, the rewards of these acts reach them. The doer gets the reward for his intention before doing the act of worship, regardless of whether he dedicated the reward to someone else or not. However, it is better for the person to perform the acts of worship for himself only and supplicate for others, as has been reported in the Quran and the Sunnah, and in accordance with the consensus of the Muslim scholars.'"
Hence, it is better to offer the charity on behalf of yourself and supplicate Allah, The Exalted, in her favor.
You should beware of letting these feelings for her lead you to commit what does not please Allah, among which is the ardent passionate love and fondness of a woman out of wedlock. This is one of the most serious ailments of the heart and is difficult to cure. For more benefit, please refer to fatwa 84544.
Allah knows best.