The Drop of Ink Left on the Pen and the Reward Kept for Moses

Yalkut Shimoni on Torah 407:1

Rabbi Yehudah bar Nachman said, when Moses wrote the Torah, a little was left over in the pen, and he passed it over his head, and from there the rays of glory were made for him, [as it is said] "And Moses did not know that the skin of his face shone" and so forth (Exodus 34:29). All the glory that he took was from the giving of reward, but the ray remains his, as it is said (Habakkuk 3:4), "Rays come forth from His hand for Him" and so forth, and when the righteous receive their reward in the world to come, he will receive his reward, as it is said (Isaiah 40:10), "Behold, the Lord GOD will come with strength, and His arm rules for Him; behold, His reward is with Him, and His recompense before Him." (Exodus 34:30) "And they were afraid to come near him" (this is written in remez 363).

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