Charles Spurgeon Commentary Jeremiah 31:11-12

"For Jehovah hath ransomed Jacob, and redeemed him from the hand of him that was stronger than he. And they shall come and sing in the height of Zion, and shall flow unto the goodness of Jehovah, to the grain, and to the new wine, and to the oil, and to the young of the flock and of the herd: and their soul shall be as a watered garden; and they shall not sorrow any more at all." — Jeremiah 31:11-12 (ASV)

And ransomed him from the hand of him that was stronger than he. Therefore they shall come-

If they are redeemed, they shall come. Christ did not die in vain; the redemption that he wrought must be effectual; therefore they shall come-