Exodus 32:29-31

Young's Literal Translation

²⁹ and Moses saith, `Consecrate your hand to-day to Jehovah, for a man [is] against his son, and against his brother, so as to bring on you to-day a blessing.'

³⁰ And it cometh to pass, on the morrow, that Moses saith unto the people, `Ye -- ye have sinned a great sin, and now I go up unto Jehovah, if so be I atone for your sin.'

³¹ And Moses turneth back unto Jehovah, and saith, `Oh this people hath sinned a great sin, that they make to themselves a god of gold;