Musnad Ahmad 27:1700

'Ali ibn 'Ayyash and 'Isam ibn Khalid narrated to us, they said: Ibn Thawban narrated to us, from his father, from Makhul, from Jubayr ibn Nufayr, from Ibn 'Umar, from the Prophet, peace and blessings of Allah be upon him, who said: "Indeed, Allah accepts the repentance of the servant as long as he does not reach the 'ghargara' (the death rattle)."