(V.4:142) See (V.57:12-15).
(V.4:145):
a) Narrated ‘Abdullâh bin ‘Amr رضي الله عنهما: The Prophet صلى الله عليه وسلم said: "Whoever has the following four (characteristics) will be a pure hypocrite and whoever has one of the following four characteristics will have one characteristic of hypocrisy unless and until he gives it up:
1. Whenever he is entrusted, he betrays (proves dishonest).
2. Whenever he speaks, he tells a lie.
3. Whenever he makes a covenant, he proves treacherous.
4. Whenever he quarrels, he behaves in a very imprudent, evil and insulting manner." (Sahih Al-Bukhâri, Vol.1, Hadîth No.33).
b) See the footnote of (V.9:54).
c) Narrated Abu Hurairah رضي الله عنه: The Prophet صلى الله عليه وسلم said, "The worst people before Allâh on the Day of Resurrection will be the double-faced people who appear to some people with one face and to other people with another face." (Sahih Al-Bukhâri, Vol.8, Hadith No.84).