John Gill Commentary Numbers 7:86

"the twelve golden spoons, full of incense, [weighing] ten [shekels] apiece, after the shekel of the sanctuary; all the gold of the spoons a hundred and twenty [shekels];" — Numbers 7:86 (ASV)

The golden spoons [were] twelve, full of incense
Which points at the use those spoons or cups were of, namely, to carry incense in them, such as were used on the day of atonement ^F12 :

[weighing] ten [shekels] apiece, after the shekel of the sanctuary ;
(See Gill on Numbers 7:14);

all the gold of the spoons [was] twenty [shekels] ;
which amounted to forty nine ounces, five drachms, scruples, and eight gains, worth about seventy five pounds of our money.

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FOOTNOTES:

• F12: Misn. Yoma, c. 4, 4. & 5, 1.