27:6 Take root - To be firmly settled in their possessions. Fruit - Their posterity shall seek habitations in other countries, and replenish them with people. But this seems to be understood of the spiritual seed of Jacob.

Isaiah 27:6 Parallel Commentaries

Joshua and the Angel
The steady advancement made by the builders of the temple greatly discomfited and alarmed the hosts of evil. Satan determined to put forth still further effort to weaken and discourage God's people by holding before them their imperfections of character. If those who had long suffered because of transgression could again be induced to disregard God's commandments, they would be brought once more under the bondage of sin. Because Israel had been chosen to preserve the knowledge of God in the earth, …
Ellen Gould White—The Story of Prophets and Kings

Covenanting Confers Obligation.
As it has been shown that all duty, and that alone, ought to be vowed to God in covenant, it is manifest that what is lawfully engaged to in swearing by the name of God is enjoined in the moral law, and, because of the authority of that law, ought to be performed as a duty. But it is now to be proved that what is promised to God by vow or oath, ought to be performed also because of the act of Covenanting. The performance of that exercise is commanded, and the same law which enjoins that the duties …
John Cunningham—The Ordinance of Covenanting

The Mercy of God
The next attribute is God's goodness or mercy. Mercy is the result and effect of God's goodness. Psa 33:5. So then this is the next attribute, God's goodness or mercy. The most learned of the heathens thought they gave their god Jupiter two golden characters when they styled him good and great. Both these meet in God, goodness and greatness, majesty and mercy. God is essentially good in himself and relatively good to us. They are both put together in Psa 119:98. Thou art good, and doest good.' This …
Thomas Watson—A Body of Divinity