وَلَا جُنَاحَ عَلَيۡكُمۡ فِيمَا عَرَّضۡتُم بِهِۦ مِنۡ خِطۡبَةِ ٱلنِّسَآءِ أَوۡ أَكۡنَنتُمۡ فِيٓ أَنفُسِكُمۡۚ عَلِمَ ٱللَّهُ أَنَّكُمۡ سَتَذۡكُرُونَهُنَّ وَلَٰكِن لَّا تُوَاعِدُوهُنَّ سِرًّا إِلَّآ أَن تَقُولُواْ قَوۡلٗا مَّعۡرُوفٗاۚ وَلَا تَعۡزِمُواْ عُقۡدَةَ ٱلنِّكَاحِ حَتَّىٰ يَبۡلُغَ ٱلۡكِتَٰبُ أَجَلَهُۥۚ وَٱعۡلَمُوٓاْ أَنَّ ٱللَّهَ يَعۡلَمُ مَا فِيٓ أَنفُسِكُمۡ فَٱحۡذَرُوهُۚ وَٱعۡلَمُوٓاْ أَنَّ ٱللَّهَ غَفُورٌ حَلِيمٞ
There is no sin on you if you hint a proposal of marriage or keep it concealed in your hearts. Allah knows that you will make mention of them, but do not make a secret promise with them, except that you may say something appropriate. Do not resolve a marriage contract until the prescribed time is reached. And know that Allah knows what is in your hearts, so be cautious of Him and know that Allah is All-Forgiving, Most Forbearing.
- i.e., the widowed or irrevocably divorced.
- e.g. by saying to her, "If one finds a wife like you, he will be happy" or so.