When the Messenger of Allah ﷺ prostrated he would say: "Allahumma laka sajadtu wa laka aslamtu wa bika amantu sajada wajhi lilladhi khalaqahu wa sawwarahu fa ahsana suratahu wa shaqqa sam'ahu wa basarahu, tabarak Allahu ahsanul-khaliqin ( O Allah, to You I have prostrated and to You I have submitted, and in You I have believed. My face has prostrated to the One Who created it and shaped it and shaped it well, and brought forth its hearing and sight. Blessed be Allah the best of Creators.)"  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا سَجَدَ يَقُولُ اللَّهُمَّ لَكَ سَجَدْتُ وَلَكَ أَسْلَمْتُ وَبِكَ آمَنْتُ سَجَدَ وَجْهِي لِلَّذِي خَلَقَهُ وَصَوَّرَهُ فَأَحْسَنَ صُورَتَهُ وَشَقَّ سَمْعَهُ وَبَصَرَهُ تَبَارَكَ اللَّهُ أَحْسَنُ الْخَالِقِينَ