Tafsir of Yusuf 12:98

"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.'' and He forgives those who repent to Him. Abdullah bin Mas`ud, Ibrahim At-Taymi, `Amr bin Qays, Ibn Jurayj and several others said that; Prophet Yaqub delayed fulfilling their request until the latter part of the night