Sunan Ibn Majah, Book 5, Hadith 1107 (In-Book) ⓘ
It was narrated from ‘Ali that whenever the Prophet prostrated he would say: “Allahumma laka sajadtu, wa bika amantu, wa laka aslamtu, Anta rabbi, sajada wajhi lilladhi shaqqa sam’ahu wa basarahu, tabarak Allah ahsanul-khaliqin (O Allah, to You I have prostrated, and in You I have believed, and to You I have submitted. You are my Lord; my face has prostrated to the One Who gave it hearing and sight. Blessed is Allah the best of Creators).”*
حَدَّثَنَا عَلِيُّ بْنُ عَمْرٍو الأَنْصَارِيُّ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ الأُمَوِيُّ، عَنِ ابْنِ جُرَيْجٍ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ عَبْدِ اللَّهِ بْنِ الْفَضْلِ، عَنِ الأَعْرَجِ، عَنِ ابْنِ أَبِي رَافِعٍ، عَنْ عَلِيٍّ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ كَانَ إِذَا سَجَدَ قَالَ " اللَّهُمَّ لَكَ سَجَدْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ أَنْتَ رَبِّي سَجَدَ وَجْهِي لِلَّذِي شَقَّ سَمْعَهُ وَبَصَرَهُ تَبَارَكَ اللَّهُ أَحْسَنُ الْخَالِقِينَ " .
also referenced under: Hadith 1054 (Reference) & Volume 2, Book 5, Hadith 1054 (DarusSalam)