Remember the Sabbath day
to keep it holy

Upper left-hand quadrant:
Then the hand of the Lord will strike your livestock in the fields - the horses, the asses, the camels, the cattle, and the sheep - with a very severe pestilence.
Exod. 9:3

Upper right-hand quadrant:
On the one was written, 'Remember the Sabbath day to keep it holy', and opposite it: 'You shall not bear false witness.'
Mekhilta According to Rabbi Ishmael.

Lower left-hand quadrant:
When Moses went up on high, he found the Holy One busy joining crowns to the letters (of the Torah, and Moses remained respectfully silent).
B. Shab 89a

Lower right-hand quadrant:
And after R. Yeshevav was slain, they brought out R. Eleazar ben Shammua for execution.
The Ten Martyrs