Charles Ellicott Commentary Exodus 15:17

"Thou wilt bring them in, and plant them in the mountain of thine inheritance, The place, O Jehovah, which thou hast made for thee to dwell in, The sanctuary, O Lord, which thy hands have established." — Exodus 15:17 (ASV)

In the mountain of your inheritance. —Some suppose Mount Moriah to be especially intended; but it is better to understand Canaan generally, which is a country consisting almost entirely of mountains, with only two plains of any extent—those of Sharon and Esdraelon.

The Sanctuary can only mean the place where God was to put his name. (See the comment on Exodus 15:13.) This is spoken of as already made and established, because it was so in the Divine counsels, as Moses very well knew. (Deuteronomy 12:11; Deuteronomy 12:14; Deuteronomy 14:23–24; and other similar passages.)