Isaiah 43:9

Let all the nations be gathered together The form of the verb in Heb. presents difficulty. By some it is treated as a rare form of imperat., on the ground of two doubtful analogies (so R.V. marg., "Gather yourselves together &c."). Others take it as a precative perf. (A.V. and R.V.) the existence of which in Heb. is also disputed (see Driver, Tenses, § 20). There seems, however, no reason why it should not be understood as a perf. in the ordinary sense: All the nations are gathered together. The assembling of the parties in the process naturally precedes the calling of witnesses; and this clause is descriptive of the scene presupposed by Isaiah 43:8. The following verb should then be pointed as a consecutive impf.: and the peoples are assembled.

who among them(the heathen gods, represented by their worshippers) can declare this i.e. the contents of the prophecy, Isaiah 43:1.

formerthings] predictions of the events that have already taken place. If they profess to do this, then let them bring forth their witnesses, in support of their contention.

or let them hear, and say The subject is the witnesses, who are supposed to hear the allegations of the false deities, and corroborate them.

be justified… It is truth see on ch. Isaiah 41:26.