And fulfil the covenant of Allah when you have made; and break not the oaths after making them firm, while you have made Allah your surety. Certainly, Allah knows what you do. And be not like unto her who, after having made it strong, breaks her yarn into pieces. You make your oaths a means of deceit between you, for fear lest one people become more powerful than another. Surely, Allah tries you therewith, and on the Day of Resurrection He will make clear to you that wherein you differed.
Islam, The Holy Qur’an, Ch.16:V.92
Fulfill the trust for the one who entrusted you, and do not cheat the one who cheated you.
Islam, The Holy Prophet (sa), Hadith of Sahih al-Bukhari
Honesty and integrity have departed from the world as if they never existed. Fraudulent and deceptive schemes for earning worldly benefits have multiplied enormously. The most mischievous person is accounted the ablest. All manner of unrighteousness, dishonesty, illegitimacy, deceit, falsehood, cunning and greed are on the increase.
Islam, the Promised Messiah (as), Essence of Islam -Volume IV, p. 141
When a man vows a vow to the Lord, or swears an oath to bind himself by a pledge, he shall not break his word; he shall do according to all that proceeds from his mouth.
Judaism, The Torah, Numbers 30:2
He who utters gentle, instructive, true words, who by his speech gives offense to none – him I call a brahmana.
Buddhism, Dhammapada, 406
You have heard that it was said to the men of old, ‘You shall not swear falsely, but shall perform to the Lord what you have sworn.’ But I say to you, do not swear at all, either by heaven, for it is the throne of God, or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King. And do not swear by your head, for you cannot make one hair white or black. Let what you say be simply ‘Yes’ or ‘No’; anything more than this comes from evil.
Christianity, The Bible, Matthew 5:33-37
It is always proper to speak the truth. It is better again to speak what is beneficial than to speak what is true. I hold that this is truth which is fraught with the greatest benefit to all creatures.
Hinduism, Mahabharata, Shanti Parva, 329:13