And when entrusted with material possessions, we do not conceal it illicitly. God commands you to give back anything the people have entrusted to you. When it comes to deposits entrusted to them, as well as any agreements they make, they are trustworthy. Their testimony is truthful. God is the truth, the Quran is the truth.
Truthfulness is a quality of the righteous.
We are enjoined to follow what is true and to condemn what is false. To knowingly deceive is to listen to the devils that only encourage us further away from God and to incur His retribution. Do not confound the truth with falsehood, nor shall you conceal the truth, knowingly. If we are asked about some matter, we should not substitute other than the truth. If we do so, then our judgment rests with God who is our witness.