At-Tawba 9:119

O you who believe, fear Allah and be with those who are truthful[87].

[87] The Prophet (ﷺ) said: “...A man speaks the truth and heeds it until he is recorded with Allah as an affirmer of the truth (siddīq)...” [Al-Bukhārī: 6094, Muslim: 2607]

O you who have believed, fear Allāh and be with those who are true.

119. O you who believe! Be afraid of Allâh, and be with those who are true (in words and deeds).[25]

[25] (V.9:119) The Statement of Allâh تعالى : ‘O you who believe! Be afraid of Allâh, and be with those who are true (in words and deeds).’ (V.9:119).
And what is forbidden as regards telling of lies.
a) Narrated ‘Abdullâh رضي الله عنه : The Prophet صلى الله عليه وسلم said, "Truthfulness leads to Al-Birr (righteousness) and Al-Birr (righteousness) leads to Paradise. And a man keeps on telling the truth until he becomes a truthful person. Falsehood leads to Al-Fujûr (i.e. wickedness - evil-doing), and Al-Fujûr leads to the (Hell) Fire, and a man keeps on telling lies until he is written as a liar before Allâh." (Sahih Al-Bukhâri, Vol.8, Hadîth No.116).
b) Narrated Abu Hurairah رضي الله عنه : Allâh’s Messenger صلى الله عليه وسلم said, "The signs of a hypocrite are three: Whenever he speaks, he tells a lie; and whenever he promises, he breaks his promise; and whenever he is entrusted, he betrays (proves to be dishonest)." (Sahih Al-Bukhari, Vol.8, Hadith No.117).
c) Narrated Samurah bin Jundub رضي الله عنه : The Prophet صلى الله عليه وسلم said, "I saw (in a dream), two men came to me." Then the Prophet صلى الله عليه وسلم narrated the story (saying): "They said: The person, the one whose cheek you saw being torn away (from the mouth to the ear) was a liar and used to tell lies and the people would report those lies on his authority till they spread all over the world. So he will be punished like that till the Day of Resurrection." (Sahih Al-Bukhari, Vol.8, Hadith No.118).

O ye who believe! Be careful of your duty to Allah, and be with the truthful.