The consequences of innovation (bid'ah) in religion

فَأَخْرَجَ لَهُمْ عِجْلًا جَسَدًا لَّهُۥ خُوَارٌ فَقَالُوا۟ هَـٰذَآ إِلَـٰهُكُمْ وَإِلَـٰهُ مُوسَىٰ فَنَسِىَ

And he extracted for them [the statue of] a calf which had a lowing sound, and they said, "This is your god and the god of Moses, but he forgot."