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Lit., "when We sent out twelve leaders from among them". This is a reference to the Biblical story (in Numbers xiii), according to which God commanded Moses to send out one leading personality from each of the twelve tribes "to spy out the land of Canaan" before the children of Israel invaded it. (The noun naqib, here rendered as "leader", has also the meaning of "investigator" or "spy" inasmuch as it is derived from the verb naqaba, which signifies - among other things - "he scrutinized" or "investigated"). The subsequent near-revolt of the children of Israel - caused by their fear of the powerful tribes which inhabited Canaan (cf. Numbers xiv) - is briefly referred to in the first sentence of verse {13} and more fully described in verses {20-26} of this surah.
I.e., by doing righteous deeds.
The interpolation of "similar" is justified by the obvious reference to verse {7} above. The pledge was similar in that it related to obedience to God's commandments.
Cf. ii. 245, n. 276. The phrase means "spending in the cause of Allah". Allah in His infinite grace looks upon this as a loan, for which He gives a recompense manifold.
Cf. ii. 63 and n. 78, "Moses... called for the elders of the people... and all the people answered together and said. 'All that the Lord hath spoken we will do.' " (Exod. xix, 7-8). This was under the towering height of Mount Sinai. The chieftains or elders or leaders of the people were selected, one from each of the twelve tribes (see ii. 60 and n. 73). For census purposes the names of the elders of the tribes are given in Num. i. 4-16: they are called "every one the head of the house of his fathers". Later, twelve other "heads of the Children of Israel" were selected to spy out the land of Canaan: their names are mentioned in Num. xiii. 1-16. See also, below, v. 20-26 and notes.
The path of rectitude: or the even way: see ii. 108. n. 109.