Mishkat al-Masabih #917

Zaid b. Thabit said: We were commanded to say after every prayer, 'Glory be to God’ thirty-three times, ‘Praise be to God’ thirty-three times, and ‘God is most great’ thirty-four times. One of the Ansar had a vision in sleep in which he was asked, “Has God’s Messenger commanded you to say ‘Glory be to God’ such and such a number of times after every prayer?” When the Ansari replied in his sleep that that was so, the visitant said, “Do it twenty-five times, and join to it ‘There is no god but God’ twenty-five times.” In the morning, when he went and told the Prophet, he said, “Do so." Ahmad, Nasa’i and DarimI transmitted it.