Ibn Abi Awfa reported: When the Messegner of Allah, peace and blessings be upon him, raised his back from bowing, he would say, “Allah has heard one who praised Him. O Allah, our Lord, to You belong praise as fills the heavens, fills the earth, and fills anything You will after them.”
Source: Ṣaḥīḥ Muslim 476
Grade: Sahih (authentic) according to Muslim
عَنْ ابْنِ أَبِي أَوْفَى قَالَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا رَفَعَ ظَهْرَهُ مِنْ الرُّكُوعِ قَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ اللَّهُمَّ رَبَّنَا لَكَ الْحَمْدُ مِلْءُ السَّمَاوَاتِ وَمِلْءُ الْأَرْضِ وَمِلْءُ مَا شِئْتَ مِنْ شَيْءٍ بَعْدُ
476 صحيح مسلم كتاب الصلاة باب ما يقول إذا رفع رأسه من الركوع