The word(s) "truthful" appears 63 time(s) in 62 verse(s) in Quran in Muhammad Habib Shakir translation.

(51) And when Our clear communications are recited to them, their argument is no other than that they say: Bring our fathers (back) if you are truthful.

(52) Say: Have you considered what you call upon besides Allah? Show me what they have created of the earth, or have they a share in the heavens? Bring me a book before this or traces of knowledge, if you are truthful.

(53) They said: Have you come to us to turn us away from our gods; then bring us what you threaten us with, if you are of the truthful ones.

(54) The believers are only those who believe in Allah and His Apostle then they doubt not and struggle hard with their wealth and their lives in the way of Allah; they are the truthful ones.

(55) They think that they lay you under an obligation by becoming Muslims. Say: Lay me not under obligation by your Islam: rather Allah lays you under an obligation by guiding you to the faith if you are truthful.

(56) Then let them bring an announcement like it if they are truthful.

(57) That you send it (not) back-- if you are truthful?

(58) And (as for) those who believe in Allah and His apostles, these it is that are the truthful and the faithful ones in the sight of their Lord: they shall have their reward and their light, and (as for) those who disbelieve and reject Our communications, these are the inmates of the hell.

(59) (It is) for the poor who fled their homes and their possessions, seeking grace of Allah and (His) pleasure, and assisting Allah and His Apostle: these it is that are the truthful.

(60) Say: O you who are Jews, if you think that you are the favorites of Allah to the exclusion of other people, then invoke death If you are truthful.