Say: "O my Servants who have transgressed against their souls! Despair not of the Mercy of Allah: for Allah forgives all sins for He is Oft-Forgiving, Most Merciful.
"Turn ye to your Lord (in repentance) and bow to His (Will), before the Penalty comes on you: After that ye shall not be helped.[Qur'an 39:53-54]

Al-Agharr al-Muzani who was from amongst the Companions of Allah's Apostle (may peace be upon him) reported that Ibn 'Umar stated to him that Allah's Messenger (may peace 'be upon him) said: O people, seek repentance from Allah. Verily, I seek repentance from Him a hundred times a day.