Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

Isaiah 18:5

Before the reaping time, when the flower has been completely formed, and the unripe grape has put forth its flower and blossomed, then shall he take away the little clusters with pruning-hooks, and shall take away the small branches, and cut them off;

Read in other translations