Abd al-Jabbar bin Wa'il (may Allah have mercy on him) narrates from his father that he said: I prayed behind the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) heard a man saying: "Allahu akbaru kabira, al-hamdu lillahi kathiran tayyiban mubarakan fih (Allah is the Greatest, greatly; all praise is for Allah, abundant, pure and blessed praise)." So the Messenger of Allah (peace and blessings be upon him) said: "I saw twelve angels rushing towards it, and the gates of the heaven were opened for it."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18279