Exodus 6:12 records Moses' identical objection about his faltering lips, reinforcing his repeated reluctance.

Exodus 4:10 gives Moses' earlier excuse about slow speech, showing the same complaint appears multiple times.

In Isaiah 6:5, the prophet laments his 'unclean lips' before God — a parallel confession of unworthiness to speak.

In Jeremiah 1:6, Jeremiah objects to his calling, citing his inability to speak — a similar prophetic reluctance.