(34) باب قَوْلِ اللَّهِ جَلَّ وَعَزَّ : {وَلاَ جُنَاحَ عَلَيْكُمْ فِيمَا عَرَّضْتُمْ بِهِ مِنْ خِطْبَةِ النِّسَاءِ أَوْ أَكْنَنْتُمْ فِي أَنْفُسِكُمْ عَلِمَ اللَّهُ} الآيَةَ إِلَى قَوْلِهِ: {غَفُورٌ حَلِيمٌ}
Ibn `Abbas said:
"Hint your intention of marrying' is made by saying (to the widow) for example: "I want to marry, and I wish that Allah will make a righteous lady available for me.' " Al-Qasim said: One may say to the widow: 'I hold all respect for you, and I am interested in you; Allah will bring you much good, or something similar 'Ata said: One should hint his intention, and should not declare it openly. One may say: 'I have some need. Have good tidings. Praise be to Allah; you are fit to remarry.' She (the widow) may say in reply: I am listening to what you say,' but she should not make a promise. Her guardian should not make a promise (to somebody to get her married to him) without her knowledge. But if, while still in the Iddat period, she makes a promise to marry somebody, and he ultimately marries her, they are not to be separated by divorce (i.e., the marriage is valid).
Reference: Sahih al-Bukhari 5124
In-book reference: Book 67, Hadith 60
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 56