OET interlinear EXO 10:10

uW Translation Notes:

יְהִ֨י כֵ֤ן יְהוָה֙ עִמָּ⁠כֶ֔ם כַּ⁠אֲשֶׁ֛ר אֲשַׁלַּ֥ח אֶתְ⁠כֶ֖ם וְ⁠אֶֽת־טַפְּ⁠כֶ֑ם

let_it_be so YHWH (Some words not found in UHB: and=he/it_said to,them let_it_be so YHWH with,you(pl) just=as let_~_go ,you(pl) and,DOM one[s]_of,your(pl)_little look_out that/for/because/then/when evil before faces_of,your(pl) )

May Yahweh be with you is usually a blessing but is almost certainly not a blessing here. It likely means something like “It will take Yahweh’s power to make me let you and your children go,” or “May Yahweh be as favorable to you as I am to the idea of letting your children go.” Pharaoh is saying that it will take Yahweh to make him do what Moses wants, but he does not think that will happen. Alternate translation: [It will be clear that Yahweh is with you if I let you and your children go]

Note 1 topic: figures-of-speech / metonymy

רְא֕וּ כִּ֥י רָעָ֖ה נֶ֥גֶד פְּנֵי⁠כֶֽם

look_out (Some words not found in UHB: and=he/it_said to,them let_it_be so YHWH with,you(pl) just=as let_~_go ,you(pl) and,DOM one[s]_of,your(pl)_little look_out that/for/because/then/when evil before faces_of,your(pl) )

The phrase for evil is before your faces could either be a warning from Pharaoh that Moses’ actions will lead to evil for the Israelites, or it could mean that Pharaoh thinks the Israelites plan something that he considers evil. Faces is a metonym for the whole person. Alternate translation: [I see that you plan evil] or [Be careful! Your actions will have bad consequences]