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Cf. the second paragraph of 7:73 - "This she-camel belonging to God shall be a token for you" - and the corresponding note [57], which explains that the "token" spoken of by Salih was to consist in the manner in which the tribe would treat the animal.
Lit., "on a day appointed", which may mean either "each on a day appointed" (i.e., by turns), or, more probably - because more in consonance with the tribal customs of ancient Arabia - "on the days appointed for the watering of camels": implying that on those days the ownerless she-camel should receive a full share of water side by side with the herds and flocks belonging to the tribe.
For this she-camel, see n. 1044 to vii. 73. Thee she-camel was to be a Sign and a test-case. Would they respect her rights of watering (and pasturage)?