Mishkat al-Masabih 146
‘A’isha said:
God’s messenger did a certain thing and gave permission for it to be done, but some people abstained from it. When God’s messenger heard of that, he delivered a sermon, and after extolling God he said, “What is the matter with people who abstain from a thing which I do? By God, I am the one of them who knows most about God and fears Him most.” 

(Bukhari and Muslim.)
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: صَنَعَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ شَيْئًا فَرَخَّصَ فِيهِ فَتَنَزَّهَ عَنْهُ قَوْمٌ فَبَلَغَ ذَلِكَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَخَطَبَ فَحَمِدَ اللَّهَ ثُمَّ قَالَ: «مَا بَالُ أَقْوَامٍ يَتَنَزَّهُونَ عَنِ الشَّيْءِ أَصْنَعُهُ فَوَاللَّهِ إِنِّي لأعلمهم بِاللَّه وأشدهم لَهُ خشيَة»