Midrasch zu Schemot 11:9

What is written above (in Exod. 11:9) on the matter? NOW THE LORD HAD SAID UNTO MOSES: PHARAOH WILL NOT HEARKEN UNTO YOU…. R. Judah and R. Nehemiah disagree. R. Judah says: This parashah says at the beginning of the plagues (in Exod. 7:4): PHARAOH WILL NOT HEARKEN UNTO YOU. But R. Nehemiah says: <The warning> is stated in its <present> place (in Exod. 11:9, which continues): <IN ORDER THAT MY WONDERS MAY BE MULTIPLIED IN THE LAND OF EGYPT, > in the sea more than in Egypt. (Exod. 11:10) SO MOSES AND AARON PERFORMED ALL THESE WONDERS…. The Holy one wished to credit this parashah to Moses alone.³⁷See Codex Vaticanus Ebr. 34, which gives the following marginal addition: R. Jacob said: A defense (Gk.: synegoria) was entered before the Holy One. It said to him: Sovereign of the Universe, (according to Exod. 11:10) MOSES AND AARON PERFORMED….; yet you wish to credit this parashah to Moses alone! The Holy One said to it: You have taught well. As you (Moses and Aaron) live, I am crediting it to both of you. Thus it is stated (in Exod. 12:1): THEN THE LORD SPOKE UNTO MOSES AND UNTO AARON …