Exodus 6:27

6:27 They were the men who were speaking to Pharaoh king of Egypt, in order to bring the Israelites out of Egypt. It was the same Moses and Aaron.

Exodus 10:8

10:8 So Moses and Aaron were brought back to Pharaoh, and he said to them, “Go, serve the Lord your God. Exactly who is going with you?” ¹ 

[10:8]  ¹ tn The question is literally “who and who are the ones going?” (מִי וָמִי הַהֹלְכִים, mi vami haholÿkhim). Pharaoh’s answer to Moses includes this rude question, which was intended to say that Pharaoh would control who went. The participle in this clause, then, refers to the future journey.