Shemot 19:1-2

Orthodox Jewish Bible

19 In the chodesh hashelishi (third new moon), after the Bnei Yisroel had their exodus from Eretz Mitzrayim, on that very day they came into the Midbar Sinai.

² For they were departed from Rephidim, and were come to Midbar Sinai, and had encamped in the midbar; and there Yisroel camped before HaHar.