O you who believe, you shall reverence GOD, and be among the truthful.

In the Quran, honesty is a command, not just good manners. Believers are told to "reverence GOD, and be among the truthful" (9:119) and to "utter only the correct utterances" (33:70). The Quran ties this to the believer's fate: God promises to "fix your works, and forgive your sins" (33:71), and on the Day of Judgment He will proclaim, "This is a day when the truthful will be saved by their truthfulness" (5:119). Truthfulness is rewarded, and it is set against hypocrisy (33:24). One of the most cutting rebukes in the Quran is aimed at people whose words do not match their deeds: "Most abominable in the sight of GOD is that you say what you do not do" (61:2-3).
The Quran works this out in several areas of life. One is trusts and agreements. God "commands you to give back anything the people have entrusted to you" (4:58), and the righteous are those who, "when it comes to deposits entrusted to them, as well as any agreements they make, they are trustworthy" (23:8). A person trusted with a bond must return it when it is due (2:283), and covenants must be fulfilled, "for a covenant is a great responsibility" (17:34). Another is trade. Prophet after prophet calls for full measure and equitable weights (11:85, 26:181-182, 6:152, 17:35), and a whole sura opens with "Woe to the cheaters," who demand full measure when they receive but cheat when they give (83:1-3). The Quran's answer to that is a reminder that they will be resurrected to stand before the Lord of the universe (83:4-6). The Quran Talk blog points out that the same word, mizan, names both the balance God built into the cosmos and the merchant's scale that must not be falsified (55:7-9).
Testimony is where honesty is tested hardest. Believers must be "absolutely equitable" as witnesses, "even against yourselves, or your parents, or your relatives," whether the accused is rich or poor, and must not be "biased by your personal wishes" (4:135). They also must not let hostility toward some people push them into injustice (5:8). Concealing what one witnessed is also dishonest: "Anyone who withholds a testimony is sinful at heart" (2:283). Among the traits of the righteous: "They do not bear false witness" (25:72). Taken together, these verses mean honesty does not bend for family, for self-interest, or for an enemy.
The Quran also refuses any double standard. It condemns people who say, "We do not have to be honest when dealing with the gentiles!" and it calls that excuse itself a lie attributed to God (3:75). The verse that follows praises "those who fulfill their obligations" (3:76). It follows that honesty is owed to everyone, whatever their religion or group. Dr. Khalifa notes in his footnote that this same verse shows ummiyyeen means "gentiles," not "illiterates" (3:75).
The gravest dishonesty is lying about God. The Quran asks, "Who is more evil than one who fabricates lies and attributes them to GOD?" (6:93). It describes people who twist their tongues to make their words sound like scripture and "utter lies and attribute them to GOD, knowingly" (3:78). It also forbids mixing truth with falsehood or hiding the truth knowingly (2:42). The Quran Talk blog argues that this makes accepting a revelation one recognizes as true a matter of plain honesty: do not deny what you know to be true.
Finally, the Quran asks for honesty inside oneself. People who try to deceive God and the believers "only deceive themselves without perceiving" (2:9). The reader is told not to accept any information "unless you verify it for yourself," because each of us is responsible for the hearing, eyesight and brain God gave us (17:36). In the Quran, then, honesty runs from the believer's own mind to their tongue, their trade and their testimony, and it reaches all the way to the truth about God.
Verses
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