Sincerity and internal intention

وَٱذْكُرُوا۟ نِعْمَةَ ٱللَّهِ عَلَيْكُمْ وَمِيثَـٰقَهُ ٱلَّذِى وَاثَقَكُم بِهِۦٓ إِذْ قُلْتُمْ سَمِعْنَا وَأَطَعْنَا ۖ وَٱتَّقُوا۟ ٱللَّهَ ۚ إِنَّ ٱللَّهَ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ

And remember the favor of Allāh upon you and His covenant with which He bound you when you said, "We hear and we obey"; and fear Allāh. Indeed, Allāh is Knowing of that within the breasts.