Exodus 6:30

Moses said before Yahweh, "Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?"

Exodus 6:12

Moses spoke before Yahweh, saying, "Behold, the children of Israel haven't listened to me. How then shall Pharaoh listen to me, who am of uncircumcised lips?"

Exodus 4:10

Moses said to Yahweh, "O Lord, I am not eloquent, neither before now, nor since you have spoken to your servant; for I am slow of speech, and of a slow tongue."

1 Corinthians 9:16-17

For if I preach the Good News, I have nothing to boast about; for necessity is laid on me; but woe is to me, if I don't preach the Good News.

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