Hadith

13. Abu Hurairah (May Allah be pleased with him) reported: I heard Messenger of Allah (PBUH) saying: "By Allah, I seek Allah's forgiveness and repent to Him more than seventy times a day.''
[Al-Bukhari].

Commentary:
1. It is an inducement for seeking pardon and forgiveness. The Prophet (PBUH), whose past and future sins were forgiven, asked Allah's forgiveness - then how about us, who commit sins on regular basis, not to seek pardon and forgiveness from Allah?

2. Sincere and ceaseless prayer for pardon is essential so that sins committed by us unintentionally are also forgiven. The above Hadith lays great emphasis on seeking pardon.

[13] وعن أبي هريرةَ قَالَ : سمعْتُ رسولَ الله يقول : « والله إنِّي لأَسْتَغْفِرُ الله وأَتُوبُ إِلَيْه في اليَوْمِ أَكْثَرَ مِنْ سَبْعِينَ مَرَّةً » . رواه البخاري . في هذا الحديث : تحريض للأمة على التوبة والاستغفار . قال ابن بطال : الأنبياء أشد الناس اجتهادًا في العبادة ، لما أعطاهم الله تعالى من المعرفة ، فهم دائبون في شكره ، معترفون له بالتقصير .
  Hadith (2). Abu Hurayrah, radi Allahu' anhu, narrated: the Prophet, sal Allahu alayhi wa sallam, said, "Being rich does not mean having a great amount of property. Being wealthy is being content."
[Muslim]