“Therefore prophesy and say, Thus says the Lord Yahweh, because, even because they have made you desolate and swallowed you up on every side, that you might be a possession to the residue of nations, and you are taken up on the lips of gossips, and the evil report of the people. Therefore you mountains of Israel hear the word of the Lord Yahweh, Thus says the Lord Yahweh to the mountain and to the hills, to the watercourses (streams and rivers) and to the valleys, to the desolate wastes and to the cities which are forsaken, who are become a prey and a derision to the residue of the nations who are round about, therefore thus says the Lord Yahweh, Surely in the fire of my jealousy I have spoken against the residue of the nations, and against all Edom, who have appointed my land to themselves for a possession, with all joy in their heart, with malice of soul, to cast it out as a prey.”
Note the continual use of ‘therefore' (see also Ezekiel 36:6-7) and the way the sentences pile up. It is intended to indicate the depths of feeling behind the words. The words were spoken in passion.
God was angry because His people, having been made desolate, had been made further desolate by what was left of the scavenging surrounding nations, who had swallowed them up and sought to take possession of them. He was also angry that they had become the subject of casual conversation and rumour and evil reports (Ezekiel 36:3). So He in turn has spoken against those nations (Ezekiel 36:5), and He declared to the land of His inheritance (‘My land') (Ezekiel 36:5), which those nations were trying to possess, that He would take further action (Ezekiel 36:7).
‘Thus says the Lord Yahweh to the mountain and to the hills, to the watercourses (streams and rivers) and to the valleys, to the desolate wastes and to the cities which are forsaken, who are become a prey and a derision to the residue of the nations who are round about.' Note the complete description taking in every part of the land. It indicated that He was fully aware of its position and was concerned for every part of it. Not one part would be ignored.
‘Surely in the fire of my jealousy I have spoken against the residue of the nations, and against all Edom, who have appointed my land to themselves for a possession, with all joy in their heart, with malice of soul, to cast it out as a prey.' Indeed He was so concerned for the land that He had given His people, for ‘His land', that he had passed sentence on the aggressors in the ‘fire of His jealousy', that is, in His deep concern over what was His. Note too that He points out the attitude of the aggressors. They acted with a fierce joy and with deep malice. They had no scruples. They enjoyed taking their revenge. This more than justified the action against them.
Note too the point that He was protecting Israel's land ready for their return. It could not be given to the nations because He yet had a purpose there for His people (Ezekiel 36:8).