Sunan Ibn Majah Book 33, Hadith 164
the Prophet (saas) used to say: "Allahum-maj'alni minal-ladhina idha ahsanu istabsharu, wa idha asa'u istaghfaru (O Allah, make me one of those who, if they do good deeds, they rejoice, and if they do bad deeds, they seek forgiveness)."
the Messenger of Allah said: "Whoever persists in asking for forgiveness, Allah will grant him relief from every worry, and a way out from every hardship, and will grant him provision from (sources) he could never imagine."
the Messenger of Allah (saas) said: "Allah, the Blessed and Exalted, said: 'Whoever does one good deed will have (the reward of) ten like it and more, and whoever does a bad deed will have one like it, or I will forgive him. Whoever draws near to Me a hand span, I draw near to him an arm's length; whoever comes to Me a forearm's length, I draw near him an arm's length; whoever comes to Me walking, I come to him in a hurry. Whoever meets Me with an earthful of sins, but does not associate anything in worship with Me, I will meet it (i.e., his sins) with forgiveness equal to that.'"