Back 
Surah 47. Muhammad
Ayah 19
19 فَٱعْلَمْ أَنَّهُۥ لَآ إِلَـٰهَ إِلَّا ٱللَّهُ وَٱسْتَغْفِرْ لِذَنۢبِكَ وَلِلْمُؤْمِنِينَ وَٱلْمُؤْمِنَـٰتِ ۗ وَٱللَّهُ يَعْلَمُ مُتَقَلَّبَكُمْ وَمَثْوَىٰكُمْ
[19] Therefore, O Prophet, know it well that there is none worthy of worship but Allah, and ask forgiveness for your fault and for the believing men and women, too,31 for Allah is aware of your busy movements and also of your resting places.
31One of the morals taught to man by Islam is also this: However hard and sincerely may man be trying to serve and worship Iris Lord and fighting and struggling in the cause of His Religion, he should never be involved in the misunderstanding that he has done and accomplished whatever he was required to do. Rather, on the contrary, he should have the feeling that he has not been able to do full justice to what was expected of him by his Lord and Master. Therefore, he should confess his errors constantly and pray to Allah saying 'Lord, forgive me for whatever fault and error I may have committed in Your service." 'this is indeed the essence of Allah's Command: 'O Prophet. ask forgiveness for your fault ..'' 'This does lint mean that God forbid. the Holy Prophet had actually committed an error willfully, but its correct meaning is that it did not even behoove the servant who was the greatest worshiper of his Lord that Ire should harbor even a tinge of the pride of accomplishment in his heart, but Iris true position also was that in spite of all his great :end glorious services he should continue confessing his shortcomings before Iris Lord. It was under this state of the mind that the Holy Prophet often implored his Lord for forgiveness. According to Abu Da'ud and Nasa'i, the Holy Prophet is reported to have said: "I implore Allah for forgiveness one hundred rimes every day.