Exodus 8:19
18 When the magicians attempted to bring forth gnats by their secret arts, they could not. So there were gnats on people and on animals. 19 The magicians said to Pharaoh, “It is the finger of God!” But Pharaoh’s heart remained hard, and he did not listen to them, just as the Lord had predicted. 20 The Lord said to Moses, “Get up early in the morning and position yourself before Pharaoh as he goes out to the water, and tell him, ‘This is what the Lord has said, “Release my people that they may serve me!
Exodus 31:18
16 The Israelites must keep the Sabbath by observing the Sabbath throughout their generations as a perpetual covenant. 17 It is a sign between me and the Israelites forever; for in six days the Lord made the heavens and the earth, and on the seventh day he rested and was refreshed.’” 18 He gave Moses two tablets of testimony when he had finished speaking with him on Mount Sinai, tablets of stone written by the finger of God.
Notes and References
"... The phrase “finger of God” occurs in another P passage (Exodus 8:19) but never in J or E. The reference to the “testimony” also is characteristic of P. Further, the mountain is referred to as Sinai, which occurs only in P and J, never in E or D. This passage connects to the next P passage, Exodus 34:29 ..."
Friedman, Richard Elliott The Bible with Sources Revealed: A New View Into the Five Books of Moses (p. 173) Harper San Francisco, 2005