Boyd’s Bible Dictionary:
Mules not bred in Palestine, but imported
(2 Sam. 13:29; 1 Kings 1:33; 2 Chron. 9:24). Warm springs meant (Gen. 36:24).
Concise Bible Dictionary:
Mule
1. pered. The first reference to this animal is in the time of David: his sons rode upon mules. David had his own mule, upon which Solomon was made to ride when he was proclaimed king. Mules were among the animals that were brought as presents by the nations to Solomon. They were also imported to Tyre. It would appear from Leviticus 19:19 that the Israelites were forbidden to breed them (2 Sam. 13:29; 2 Sam. 18:9; 1 Kings 1:33, 38, 44; 1 Kings 10:25; Psa. 32:9; Isa. 66:20; Ezek. 27:14; Zech. 14:15).
2. rekesh. This was probably a swift horse on which dispatches were sent (Esther 8:10,14). The word is once translated “dromedary” (1 Kings 4:28); and once “swift beast” (Mic. 1:13).
3. yemint. This is acknowledged to be wrongly rendered in the AV; it is translated “hot springs,” by the Revisers and others (Gen. 36:24).