Exodus 6:30

And Moses said before Yahweh, "Look, I [am] {a poor speaker}. And how will Pharaoh listen to me?"

Exodus 6:12

And Moses spoke before Yahweh, saying, "Look, the {Israelites} do not listen to me, and how will Pharaoh listen to me, since I [am] {a poor speaker}?"

Exodus 4:10

And Moses said to Yahweh, "Please, Lord, I [am] not a man of words, {neither recently nor in the past nor since your speaking} to your servant, because I [am] heavy of mouth and of tongue."

1 Corinthians 9:16-17

For if I proclaim the gospel, it is not to me a reason for boasting, for necessity is imposed on me. For woe is to me if I do not proclaim the gospel.

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