My father sought permission from the Prophet ﷺ. (When permission was granted and he came near him) he lifted his shirt, and began to kiss him and embrace him (out of love for him). He asked: Messenger of Allah, what is the thing which it is unlawful to refuse? He replied: Water. He again asked: Prophet of Allah, what is the thing which it is unlawful to refuse? He replied: Salt. He again asked: Prophet of Allah, what is the thing which it is unlawful to refuse? He said: To do good is better for you.  

قَالَتِ اسْتَأْذَنَ أَبِي النَّبِيَّ ﷺ فَدَخَلَ بَيْنَهُ وَبَيْنَ قَمِيصِهِ فَجَعَلَ يُقَبِّلُ وَيَلْتَزِمُ ثُمَّ قَالَ يَا رَسُولَ اللَّهِ مَا الشَّىْءُ الَّذِي لاَ يَحِلُّ مَنْعُهُ قَالَ الْمَاءُ قَالَ يَا نَبِيَّ اللَّهِ مَا الشَّىْءُ الَّذِي لاَ يَحِلُّ مَنْعُهُ قَالَ الْمِلْحُ قَالَ يَا رَسُولَ اللَّهِ مَا الشَّىْءُ الَّذِي لاَ يَحِلُّ مَنْعُهُ قَالَ أَنْ تَفْعَلَ الْخَيْرَ خَيْرٌ لَكَ