Surah Al-An'am — Ayah 77 (6:77)
فَلَمَّا رَءَا ٱلۡقَمَرَ بَازِغٗا قَالَ هَٰذَا رَبِّيۖ فَلَمَّآ أَفَلَ قَالَ لَئِن لَّمۡ يَهۡدِنِي رَبِّي لَأَكُونَنَّ مِنَ ٱلۡقَوۡمِ ٱلضَّآلِّينَ ٧٧
English translation (Saheeh International)
And when he saw the moon rising, he said, "This is my lord." But when it set, he said, "Unless my Lord guides me, I will surely be among the people gone astray."
Brief commentary
When Abraham saw the moon rising, he said to his people, ‘This is my Lord’, continuing his argument against them. When it disappeared, he said, ‘If Allah does not guide me to His Oneness and worship I will certainly become one of the people who are astray from His religion and who worship others besides Him’.