Jamieson, Fausset and Brown on Ezekiel 20:40

40. For--Though ye, the rebellious portion, withdraw from My worship, others, even the believing remnant, will succeed after you perish, and will serve Me purely.

in mine holy mountain--(Is 2:2, 3). Zion, or Moriah, "the height of Israel" (pre-eminent above all mountains because of the manifested presence of God there with Israel), as opposed to their "high places," the worship on which was an abomination to God.

all--not merely individuals, such as constitute the elect Church now; but the whole nation, to be followed by the conversion of the Gentile nations (Is 2:2, "all nations;" Ro 11:26; Re 11:15).

with--rather, "in all your holy things" [Maurer].