Riyad as-Salihin Hadith 1159

We left Makkah with the Messenger of Allah (ﷺ) for Al-Madinah, and when we were near 'Azwara,' he (ﷺ) alighted (from his riding-camel) raised his hands in supplication to Allah for a while and prostrated himself. He remained for a long time in prostration. Then he stood up and raised his hands for a while, after which he prostrated himself (again), and remained for a long time in prostration. Then he stood up and raised his hands for a while, after which he prostrated himself for the third time. Then he (ﷺ) said, "I supplicated my Rubb and made intercession for my Ummah, and He granted me one-third of them. So I again prostrated myself in gratitude to my Rubb. Then I raised my head and supplicated my Rubb for my Ummah, and He granted me another third of them. Again I raised my head and supplicated my Rubb for my Ummah and He granted me the last third of them. So I fell into prostration out of gratitude before my Rubb." [Abu Dawud].