Matthew Poole and continuators on Deuteronomy 33:27

27 The eternal God is thy refuge , and underneath are the everlasting arms: and he shall thrust out the enemy from before thee, and shall say, Destroy them .

Or, thy dwelling-place. Compare Psal. 91. 1.

(i. e.) Under thy arms to hold thee up, as my hands were once held up by Aaron and Hur. He will support and defend thee. Or the meaning is, Though he dwelleth on high, yet he comes down to the earth beneath to assist and deliver thee.

(i. e.) Shall give thee not onely command and commission, but also power to destroy them, for Gods saying is doing, his word comes with power.