Al-Mujadila 58:12

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓاْ إِذَا نَٰجَيۡتُمُ ٱلرَّسُولَ فَقَدِّمُواْ بَيۡنَ يَدَيۡ نَجۡوَىٰكُمۡ صَدَقَةٗۚ ذَٰلِكَ خَيۡرٞ لَّكُمۡ وَأَطۡهَرُۚ فَإِن لَّمۡ تَجِدُواْ فَإِنَّ ٱللَّهَ غَفُورٞ رَّحِيمٌ 12

O you who have believed, when you [wish to] privately consult the Messenger, present before your consultation a charity. That is better for you and purer. But if you find not [the means] - then indeed, Allah is Forgiving and Merciful