Abdullah ibn Masood(r.a.a) relates that the Prophet
(s.a.w) said ‘A true action leads to the path of
virtue and good deeds, and virtue paves the way of a
person to Paradise, and the said person continues to
speak the truth till in the sight of Allah he is named
Siddiq (Truthful). lying leads to vice, and vice
leads to indecent acts and a person goes on lying till
in the sight of Allah he is named a liar.’
(Bukhari and Muslim)
from Riyadh us-Saleheen, hadith #54