22:3a David provided a large quantity of iron

David supplied plenty of iron
-or-
He collected a lot of iron

22:3b to make the nails for the doors of the gateways and for the fittings,

for making nails and hinges for the gate doors. (English Easy-to-Read Version)
-or-
to make things for the temple. That was for nails and bars to attach to the doors at the entrances. (EEB)

22:3c together with more bronze than could be weighed

He also provided so much bronze for making the altar and various utensils, that no one could weigh it all. (Translation for Translators)
-or-
He also gave them more bronze than they could weigh,

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