Matthew Poole and continuators on 1 Samuel 17:54

54 And David took the head of the Philistine, and brought it to Jerusalem ; but he put his armour in his tent .

Either, to terrifie the Iebusites, who yet held the Fort of Zion, 2 Sam. 5. 7. or, for some other reason not Recorded, nor now known.

i. e. In the Tent which was erected for him in the Camp, upon this occasion. There it was kept for the present; though afterwards it seems to have been translated to the Tabernacle; where we find his Sword, Chap. 21. and it is not unlikely the rest of his Armour was there also.