Upper left-hand quadrant: Moses and Aaron did just as the Lord commanded: he lifted up the rod and struck the water in the Nile in the sight of Pharaoh and his courtiers.... Exod. 7:20, 21
Upper right-hand quadrant: R. Simai expounded: When Israel hastened to say, "We will do," before saying, "We will hearken," sixty myriads of ministering angels came down and fastened two crowns upon each and every one in Israel, one as a reward for saying, "We will do," and the other as a reward for saying, "We will hearken".... B. Shab. 88a
Lower left-hand quadrant: Therefore man was created singly, to teach you that whoever destroys a single soul of Israel, Scripture accounts it as if he had destroyed a full world; and whoever saves one soul of Israel, Scripture accounts it as if he had saved a full world. Mishna Sanhedrin 4:5
Lower right-hand quadrant: R. Judah said in the name of Rav: When Moses ascended on high, he found the Holy One affixing crowns to letters.... B. Men 29b