When Yusuf’s brothers (alayhum as salam) said to their father, with humbleness,
[قَالُواْ يأَبَانَا اسْتَغْفِرْ لَنَا ذُنُوبَنَآ إِنَّا كُنَّا خَـطِئِينَ – قَالَ سَوْفَ أَسْتَغْفِرُ لَكُمْ رَبِّى إِنَّهُ هُوَ الْغَفُورُ الرَّحِيمُ ]
“O our father! Ask forgiveness (from Allah) for our sins, indeed we have been sinners.”
He said: “I will ask my Lord for forgiveness for you, verily, He! Only He is the Oft-Forgiving, the Most Merciful”.
`Abdullah bin Mas`ud, Ibrahim At-Taymi, `Amr bin Qays, Ibn Jurayj and several others said that Prophet Ya`qub (alayhis salam) delayed fulfilling their request until the latter part of the night.
Tafsir of Surah Yusuf