Three are the signs of a hypocrite, even if he observed fast and prayed and asserted that he was a Muslim.
وَقَالَ آيَةُ الْمُنَافِقِ ثَلاَثٌ وَإِنْ صَامَ وَصَلَّى وَزَعَمَ أَنَّهُ مُسْلِمٌ
from the Prophet ﷺ who said, "Three ˹traits˺ that if a man possesses them then he is a hypocrite – even if he fasts, prays, or claims to be a Muslim: one who (1) when he speaks, he lies, (2) when he promises, he breaks it, and (3) when he is entrusted, he betrays." (Using translation from Aḥmad 10925)
"آيَةُ اْلمُنَافق ثَلاثٌ - وَإِن صَامَ وَصَلَّى وَزَعَم أنَّه مُسْلِمٌ - إذَا حَدَّث كَذَبَ، وَإِذَا وَعَدَ أخَلفَ، وَإذَا ائْتُمِنَ خَانَ"