On the first day of the third month after the Israelites left Egypt—on that very day—they came to the Desert of Sinai.
NMVIn the third month, when the people of Yisra’el [He Holds Onto The Heel Of God] were gone forth out of the land of Mitzrayim [Egypt - The Narrow Place], the same day came they [into] the wilderness of Sinai.
OJBIn 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.
Onkelos (Etheridge)In the third month of the outgoing of the sons of Israel from the land of Mizraim, on that day came they to the desert of Sinai.
T4T[19:1–2]The Israeli people then left Rephidim, and exactly two months after leaving Egypt, they/we came to the desert near Sinai Mountain. They/We set up their/our tents at the base of the mountain.