C. F. Keil and Franz Delitzsch on Daniel 10:17-19

Dan 10:17-19

Therefore he may not talk with this Lord, i.e., with Him who appeared before him in such dread majesty; and he is yet in such a state, since all strength has departed from him and his breath has gone, that he fears he must die; cf. 1Ki 17:17. Then once more one like the appearance of a man touched him. אדם כּמראה is in reality = אדם בּני כּדּמוּת: both forms of expression leave the person of him who touched him undefined, and only state that the touching proceeded from some one who was like a man, or that it was such as proceeds from men, and are like the expression used in Dan 10:19, “a hand touched me.” From this it does not follow that he who spoke to him touched him, but only that it was a spiritual being, who appeared like to a man. After thus being touched for the third time (Dan 10:18), the encouragement of the angel that talked with him imparted to him full strength, so that he could calmly listen to and observe his communication.