Jamieson, Fausset and Brown on Song of Solomon 4:6

6. Historically, the hill of frankincense is Calvary, where, "through the eternal Spirit He offered Himself"; the mountain of myrrh is His embalmment (Joh 19:39) till the resurrection "daybreak." The third Canticle occupies the one cloudless day of His presence on earth, beginning from the night (So 2:17) and ending with the night of His departure (So 4:6). His promise is almost exactly in the words of her prayer (So 2:17), (the same Holy Ghost breathing in Jesus Christ and His praying people), with the difference that she then looked for His visible coming. He now tells her that when He shall have gone from sight, He still is to be met with spiritually in prayer (Psa 68:16; Mt 28:20), until the everlasting day break, when we shall see face to face (1Co 13:10, 12).