Example in the Quran

۞ أَتَأۡمُرُونَ ٱلنَّاسَ بِٱلۡبِرِّ وَتَنسَوۡنَ أَنفُسَكُمۡ وَأَنتُمۡ تَتۡلُونَ ٱلۡكِتَٰبَۚ أَفَلَا تَعۡقِلُونَ

Do you preach righteousness and fail to practice it yourselves, although you read the Scripture? Do you not understand?