פּירוש אויף שמות 18:6

ויאמר אל משה AND HE SAID UNTO MOSES through a messenger (Mekhilta).

"And he said to Moses, 'I, your father-in-law, Yisro, have come to you, and [together with me is] your wife and her two sons are with her (Exodus 18:6).' It seems [Yisro] made himself the essential [focus] when he should have made [Moses'] wife and sons the essential focus. And indeed, [Yisro was correct in his wording] as he knew the truth. The essential [purpose of the] his journey was his own conversion, and therefore he said, 'I, your father-in-law, Yisro, have come... as this is the main point of my arrival.' However, due to his great humility, he was afraid that Moses might not accept him. [And so] he added, 'and your wife and her two sons,' since he also came to bring his sons and wife to him. Nevertheless, Moses understood this from the way he phrased it, especially after hearing from God that his coming was for the sake of Heaven, as mentioned.

ויאמר, “he said:” the subject is Yitro’s messenger announcing his impending arrival in the camp of the Israelites.