וַיִּסְע֖וּ מֵרְפִידִ֑ם וַֽיַּחֲנ֖וּ בְּמִדְבַּ֥ר סִינָֽי׃
And they journeyed from Rephidim, and pitched in the wilderness of Sinai.
Chizkuni
ויחנו במדבר סיני, “they encamped in the desert of Sinai. This is the desert Sin. Our author commented on the names in the portion of Yitro, that the letter,10) י), was added to the name of this desert to commemorate that the Ten Commandments had been given there.