Here the Lord quotes Isaiah, speaking of a great day of rejoicing in the future, a time when the scattered remnants of Israel will be gathered home to their Lord and to the lands of their inheritance, an era when those who have come into the faith from their scattered condition will outnumber those Israelites who had already found their way into the true Church.
“Enlarge the Place of Thy Tent”
The command here is to spread out, to make room for those who are to be gathered home.
“For Zion must increase in beauty, and in holiness; her borders must be enlarged; her stakes must be strengthened; yea, verily I say unto you, Zion must arise and put on her beautiful garments” (D&C 82:14; compare Isaiah 33:20).