When the Messenger of Allah ﷺ raised his head from bowing, he would say, "Allah hears whoever praises Him. Our Lord, to You belongs all praise, filling the heavens, filling the earth, and filling whatever else You will."
حدثنا وكيع حدثنا الأعمش عن عبيد بن الحسن المزني قال سمعت
كان رسول الله ﷺ إذا رفع رأسه من الركوع قال سمع الله لمن حمده اللهم ربنا لك الحمد ملء السماوات وملء الأرض وملء ما شئت من شيء بعد
Its chain of transmission is sahih. Ubayd bin Hasan Muzani is reliable, and his hadith is found in Muslim. This hadith was mentioned many times before. See 11767.