It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Sayyiduna Ibrahim (peace be upon him) told only three lies: 1: Regarding their gods, he said: 'Rather, this largest of them did it.' [Al-Anbiya: 63] 2: When they invited him (to go) to their gods, he said: 'Indeed, I am ill.' [Al-Saffat: 89] 3: He called Sayyidah Sarah (may Allah be pleased with her) his sister."
This hadith is established. His saying: 'Rather, this largest of them did it.' [Al-Anbiya: 63] was said by way of rebuke and to make clear that their gods could not make anything. (And 'Indeed, I am ill.' [Al-Saffat: 89] means that he would soon become ill; and when he called Sayyidah Sarah (may Allah be pleased with her) his sister, it was the bond of Islam.) And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20834