Sihor is a name for water on the Egypt side of the map. Joshua 13:3 marks it as a border, “Sihor, which is before Egypt,” and David gathers all Israel “from Shihor of Egypt” to bring the ark home (1 Chronicles 13:5). Isaiah uses it for the river whose harvest enriches a trading city. Jeremiah turns it into a question for Israel: “what hast thou to do in the way of Egypt, to drink the waters of Sihor?” (Jeremiah 2:18). The point is plain: do not look to foreign waters for what only God supplies.
4 verses
From Sihor, which is before Egypt, even unto the borders of Ekron northward, which is counted to the Canaanite: five lords of the Philistines; the Gazathites, and the Ashdothites, the Eshkalonites, the Gittites, and the Ekronites; also the Avites:
So David gathered all Israel together, from Shihor of Egypt even unto the entering of Hemath, to bring the ark of God from Kirjathjearim.
And by great waters the seed of Sihor, the harvest of the river, is her revenue; and she is a mart of nations.
And now what hast thou to do in the way of Egypt, to drink the waters of Sihor? or what hast thou to do in the way of Assyria, to drink the waters of the river?
Matthew George Easton, 1897
(correctly Shi’hor) black; dark the name given to the river Nile in Isa. 23:3; Jer. 2:18. In Josh. 13:3 it is probably “the river of Egypt”, i.e., the Wady el-Arish (1 Chr. 13:5), which flows “before Egypt”, i.e., in a north-easterly direction from Egypt, and enters the sea about 50 miles south-west of Gaza.
William Smith, 1884
(dark), accurately Shi’hor, once The Shihor, or Shihor of Egypt, when unqualified a name of the Nile. It is held to signify "the black" or "turbid." In Jeremiah the identity of Shihor with the Nile seems distinctly stated. (Jeremiah 2:18) The stream mentioned in (1 Chronicles 13:5) is possibly that of the Wadi l” Areesh .