They shall bring all your brethren... — The offering is the minchah, the bloodless meatoffering of the Levitical law (Leviticus 2:1-2). The underlying thought is that the returning exiles would be the most acceptable offering that could be brought to Jehovah. The same idea appears in Zephaniah 3:10, and a similar one, transferred, however, to the Gentile converts, in Romans 15:16.
Upon horses, and in chariots... — The list of the modes of transport, as in Zechariah 14:15, points to the various habits of the many nations who are to be sharers in the work.
As the children of Israel... — The “clean offering” is, as before, the minchah. The heathen, or, perhaps, even the chariots and litters on which they brought the exiles, are as the “clean vessels” in which the minchah was brought to the Temple.