Allah's Messenger (ﷺ) said, "Abraham did not tell a lie except on three occasions."

Abraham did not tell a lie except on three occasion. Twice for the Sake of Allah when he said, "I am sick," and he said, "(I have not done this but) the big idol has done it." The (third was) that while Abraham and Sarah (his wife) were going (on a journey) they passed by (the territory of) a tyrant. Someone said to the tyrant, "This man (i.e. Abraham) is accompanied by a very charming lady." So, he sent for Abraham and asked him about Sarah saying, "Who is this lady?" Abraham said, "She is my sister." Abraham went to Sarah and said, "O Sarah! There are no believers on the surface of the earth except you and I. This man asked me about you and I have told him that you are my sister, so don't contradict my statement." The tyrant then called Sarah and when she went to him, he tried to take hold of her with his hand, but (his hand got stiff and) he was confounded. He asked Sarah. "Pray to Allah for me, and I shall not harm you." So Sarah asked Allah to cure him and he got cured. He tried to take hold of her for the second time, but (his hand got as stiff as or stiffer than before and) was more confounded. He again requested Sarah, "Pray to Allah for me, and I will not harm you." Sarah asked Allah again and he became alright. He then called one of his guards (who had brought her) and said, "You have not brought me a human being but have brought me a devil." The tyrant then gave Hajar as a girl-servant to Sarah. Sarah came back (to Abraham) while he was praying. Abraham, gesturing with his hand, asked, "What has happened?" She replied, "Allah has spoiled the evil plot of the infidel (or immoral person) and gave me Hajar for service." (Abu Huraira then addressed his listeners saying, "That (Hajar) was your mother, O Bani Ma-is-Sama (i.e. the Arabs, the descendants of Ishmael, Hajar's son).

that the Messenger of Allah (ﷺ) said: "Ibrahim, peace be upon him, did not lie about anything at all - except for three: 'Verily I am sick (37:89)' while he was not sick. And his saying about Sarah: 'She is my sister' and his saying: 'Nay, this one, the biggest of them did it (21:63).'"

The Messenger of Allah (ﷺ) said: 'Whoever takes an oath to follow a religion other than Islam, telling a deliberate lie, he will be as he said.'"

Zaid bin 'Amr bin Nufail went to Sham, inquiring about a true religion to follow. He met a Jewish religious scholar and asked him about their religion. He said, "I intend to embrace your religion, so tell me some thing about it." The Jew said, "You will not embrace our religion unless you receive your share of Allah's Anger." Zaid said, "'I do not run except from Allah's Anger, and I will never bear a bit of it if I have the power to avoid it. Can you tell me of some other religion?" He said, "I do not know any other religion except the Hanif." Zaid enquired, "What is Hanif?" He said, "Hanif is the religion of (the prophet) Abraham who was neither a Jew nor a Christian, and he used to worship None but Allah (Alone)" Then Zaid went out and met a Christian religious scholar and told him the same as before. The Christian said, "You will not embrace our religion unless you get a share of Allah's Curse." Zaid replied, "I do not run except from Allah's Curse, and I will never bear any of Allah's Curse and His Anger if I have the power to avoid them. Will you tell me of some other religion?" He replied, "I do not know any other religion except Hanif." Zaid enquired, "What is Hanif?" He replied, Hanif is the religion of (the prophet) Abraham who was neither a Jew nor a Christian and he used to worship None but Allah (Alone)" When Zaid heard their Statement about (the religion of) Abraham, he left that place, and when he came out, he raised both his hands and said, "O Allah! I make You my Witness that I am on the religion of Abraham."