Thou hast not given water - It was esteemed a great virtue in the East to furnish thirsty travelers with water; especially in the deserts, where scarcely a stream was to be found, and where wells were very rare. Some of the Indian devotees are accustomed to stand with a girbah or skin full of water, on the public roads, to give drink to weary travelers who are parched with thirst.
Thou hast not given water to the weary - That is, thou hast withheld the rites of hospitality - one of the most grievous offences which could be charged on an Arabian; compare the notes at Isaiah 21:14. In all the Oriental world, hospitality was regarded, and is still, as a duty of the highest obligation.