Why did our Lord, though not partaking of the bread when instituting His supper, drink of the cup?

Why did our Lord, though not partaking of the bread when instituting His supper, drink of the cup?

Can there be some spiritual truth hidden in this?

We think the idea that the Lord partook of the cup (as above) is based on a misunderstanding of the accounts of the Institution, and on a false inference. The misunderstanding arises from the position of the words, “I will not drink henceforth of this fruit of the vine,” in the Matthew and Mark accounts, and the false inference, from the idea that the Lord had necessarily that moment drunk of the cup in question. It is clear from the Luke 22: account that there were two cups, that in the 17th verse which was the passover cup, and the other the cup of the new supper, the memorials of His body and blood. It was to the former (see v. 18) that the Lord’s words, above quoted, refer. The Lord did not Himself partake of the emblems of His death in either kind, as Luke’s account shews.

W.H.