It is narrated from various chains from Muslim in his authentic collection from M'azuz Ibn Suwyd from Abu Dhar (may Allah be pleased with him) that the Prophet (may Allah bestow peace and blessings upon him) said,
"Allah, the Exalted, said, "Whoever approaches a hand span; I approach him by a cubit; whoever approaches me a cubit; I approach him walking; whoever comes to me walking I come to him speedily. Whoever turns to me with sins like the Earth and do not associate anything to me; I give him similar amount forgiveness."
[Bukhari and Muslim]
"I swear by the one who contains my soul, if you sin until your mistakes fill what's between the skies and the Earth then you sought forgiveness from Allah; he would forgive you."
[Ahmad in al-Musnad]
This includes the hadith of Anas, in the beginning, mentions these three causes of attaining forgiveness. (That is now explained).