Sayyiduna Wa'il bin Hujr (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) was praying when a man came and joined the row, and he said: "Allahu akbaru kabira, wa subhanallahi bukratan wa asila (Allah is the Greatest, greatly; and glory be to Allah, morning and evening)." When the Prophet (peace and blessings be upon him) said the salam, he said: "Who said these words?" The man said: It was I, O Messenger of Allah! I intended nothing by them but good. He (peace and blessings be upon him) said: "I saw that the gates of the heaven were opened, and they did not stop short of reaching the Throne."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18275