When the Messenger of Allah (may Allah’s peace and blessings be upon him) raised his back from Rukū‘ (bowing), he would say: "Sami‘a allāhu liman hamidah
عَنِ ابْنِ أَبِي أَوْفَى رضي الله عنه قَالَ: كَانَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ إِذَا رَفَعَ ظَهْرَهُ مِنَ الرُّكُوعِ قَالَ: «سَمِعَ اللهُ لِمَنْ حَمِدَهُ، اللَّهُمَّ رَبَّنَا لَكَ الْحَمْدُ، مِلْءَ السَّمَاوَاتِ وَمِلْءَ الْأَرْضِ وَمِلْءَ مَا شِئْتَ مِنْ شَيْءٍ بَعْدُ».
Explanation
When the Prophet (may Allah's peace and blessings be upon him) raised his back from Rukū 'in prayer, he would say: "Allah hears he who praises Him", i.e., Whoever praises Allah Almighty, Allah Almighty responds to him. It was said: He praises and rewards him. Then, he would praise Allah by saying: "O Allah, our Lord, to You is the praise as much as fills the heavens, as much as fills the earth, and as much as fills whatever You will thereafter."
Praise that fills the heavens and the earth and what is between them and fills anything Allah wills.
Source
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