مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2493
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that when the Prophet (ﷺ) wanted to prostrate after bowing, he would say: "O Allah our Lord, to You be praise filling the heaven, filling the earth and filling whatever else You will.”
Musnad Ahmad 2505A saheeh hadeeth]