Jamieson, Fausset and Brown on Song of Solomon 5:15

15. pillars--strength and steadfastness. Contrast man's "legs" (Ec 12:3). Allusion to the temple (1Ki 5:8, 9; 7:21), the "cedars" of "Lebanon" (Psa 147:10). Jesus Christ's "legs" were not broken on the cross, though the thieves' were; on them rests the weight of our salvation (Psa 75:3).

sockets of fine gold--His sandals, answering to the bases of the pillars; "set up from everlasting" (Pr 8:22, 23). From the head (So 5:11) to the feet, "of fine gold." He was tried in the fire and found without alloy.

countenance--rather, "His aspect," including both mien and stature (compare 2Sa 23:21, Margin; with 1Ch 11:23). From the several parts, she proceeds to the general effect of the whole person of Jesus Christ.

Lebanon--so called from its white limestone rocks.

excellent--literally, "choice," that is, fair and tall as the cedars on Lebanon (Eze 31:3, &c.). Majesty is the prominent thought (Psa 21:5). Also the cedars' duration (He 1:11); greenness (Lu 23:31), and refuge afforded by it (Eze 17:22, 23).