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Most of the classical commentators (e.g., Tabari, Zamakhshari, Razi, Baydawi) point out that this phrase can be understood in either of two senses, namely: "Give in unto me, O God's bondmen ('ibad )", implying a call to the Egyptians (since all human beings are "God's bondmen") to accept the divine message which Moses was about to convey to them; or, alternatively, "Give up to me God's servants", i.e., the children of Israel, who were kept in bondage in Egypt. Inasmuch as the vocalization 'ibada is applicable to the vocative as well as the accusative case either of these two interpretations is legitimate.
Meaning, let my people go.
The argument of Moses and his "authority manifest" will be found at vii. 104-108, 120-126, 130-137. Notice how fully he assumes the authority of his office here. He claims all "servants of Allah", i.e., true worshippers, as under his protection, for his mission was both to the Egyptians and the Israelites; he asks that they should be restored to him; and he boldly denounces the Pharaoh's arrogance "as against Allah".
"Worthy of all trust": Amin, a title applied to prophets in S. xxvi.:e.g., see xxvi. 107. As the holy Prophet had historically earned that title among his own people, the reminiscences of the story of Moses apply to him in his relations with the arrogant Quraish.