Surah 26. Ash-Shuara, Ayah 82

 It is reported in an authentic narration collected by At-Tirmiⱬi that Prophet Muḥammad (ﷺ) said that Abraham (ﷺ) did not tell the full truth only on three different occasions: when he justified his absence from the pagan festival by saying ‘I am really sick’ (see 37:89), and when he destroyed the idols and blamed it on the biggest one (see 21:63), and when he said that Sarah was his sister to save her from a tyrant ruler.