Jamieson, Fausset and Brown on Song of Solomon 1:13

13. bundle of myrrh--abundant preciousness (Greek), (1Pe 2:7). Even a little myrrh was costly; much more a bundle (Col 2:9). Burrowes takes it of a scent-box filled with liquid myrrh; the liquid obtained by incision gave the tree its chief value.

he--rather, "it"; it is the myrrh that lies in the bosom, as the cluster of camphire is in the vineyards (So 1:14).

all night--an undivided heart (Ep 3:17; contrast Jr 4:14; Eze 16:15, 30). Yet on account of the everlasting covenant, God restores the adulteress (Eze 16:60, 62; Ho 2:2, &c.). The night is the whole present dispensation till the everlasting day dawns (Ro 13:12). Also, literally, "night" (Psa 119:147, 148), the night of affliction (Psa 42:8).