Exodus 6:30

6:30 But Moses said before the Lord, “Since I speak with difficulty, ¹  why should Pharaoh listen to me?”

Exodus 39:23

39:23 There was an opening in the center of the robe, like the opening of a collar, with an edge all around the opening so that it could not be torn.

¹ tn See note on Exod 6:12.