John Trapp on Isaiah 56:6

Ver. 6. Alſo the ſons of the ſtranger that joyneth] Relinquiſhing his heatheniſh ſuperſtition, and devoting himſelf to my fear. The Levites had their name from the word here uſed; and Leviathan, whoſe ſcales and parts are ſo faſt joyned and joynted together.

To love the name of the Lord, to be his ſervants] Plato could ſay, Parere legibus eſt Deo ſervire: & haec ſumma est libertas. To obey the laws, is to ſerve God; and this is the chiefeſt liberty, this is perfect freedom; But Plato never knew what it was to love to be Gods ſervant. In Pſal. 1. Lex voluntarios quaerit, ſaith Ambroſe. All Gods Souldiers are volunteires, all his people free-hearted, Pſal. 110.3. they wait for his Law, Iſa. 42.8. See Deut 10.12.

Every one that keepeth the Sabbath] See on ver. 2.