Citations about truth from religious texts 
(in alphabetical order by the name of the religion)

Him I call indeed a Brahmana who utters true speech, instructive and free from harshneww, so that he offends no one. --- Buddhism

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Putting away lying, speak every man truth with his neighbor: for we are members one of another. --- Christianity

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Sincerity is the way of heaven, and to think how to be sincere is the way of a man. Never was there one possessed of complete sincerity who did not move others. Never was there one without sincerity who was able to move others. --- Confucianism

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Say what is true! Do thy duty. Do not swerve from the truth. --- Hinduism

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Do not clothe the truth with falsehood; do not knowingly conceal the truth. --- Islam

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Speak ye every man truth to his neighbor; execute the judgement of truth and peace in your gates. --- Judaism

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From the book, Oneness: Great Principles Shared by All Religions, by Jeffrey Moses