Exodus 19:1
“In the third month, when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wilderness of Sinai.”
In the third month, when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wilderness of Sinai.
For they were departed from Rephidim, and were come to the desert of Sinai, and had pitched in the wilderness; and there Israel camped before the mount.
And Moses went up unto God, and the Lord called unto him out of the mountain, saying, Thus shalt thou say to the house of Jacob, and tell the children of Israel;
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And he said, Certainly I will be with thee; and this shall be a token unto thee, that I have sent thee: When thou hast brought forth the people out of Egypt, ye shall serve God upon this mountain.”
“And they shall hearken to thy voice: and thou shalt come, thou and the elders of Israel, unto the king of Egypt, and ye shall say unto him, The Lord God of the Hebrews hath met with us: and now let us go, we beseech thee, three days’ journey into the wilderness, that we may sacrifice to the Lord our God.”
“Even unto the morrow after the seventh sabbath shall ye number fifty days; and ye shall offer a new meat offering unto the Lord.”
“And they departed from Rephidim, and pitched in the wilderness of Sinai.”
“This month shall be unto you the beginning of months: it shall be the first month of the year to you.”