Isaiah 56:4

“For thus saith the Lord unto the eunuchs that keep my sabbaths, &c.] That fear and serve the Lord; religiously observe all times of divine worship, and walk in all the commandments and ordinances of the Lord; show regard to all the institutions of the Gospel, and perform all religious exercises, private and public, on Lord’s days, and at other times: and choose the things that please me; who do that which is wellpleasing unto God, which he has declared in his word to be acceptable to him; and do that from right principles, with right views, and of choice; not forced to it by those who have authority over them, or led to it merely by example and custom: and take hold of my covenant; not the…”

“please me--sacrifice their own pleasure to mine. take hold--so "layeth hold" (see on Isa 56:2).”

“For thus saith the Lord unto the eunuchs - Even the eunuchs, who have hitherto been excluded from the privileges of the people of God, and who have been regarded as a separated and degraded people, shall be admitted to the same privileges as others. That keep my sabbaths - The word is used here in the plural, though the weekly Sabbath is probably particularly intended. It may be, however, that the word is used to represent religious observances in general (see the notes at Isaiah 56:2). And choose the things that please me - Who will be willing to sacrifice their own pleasure and preferences to those things which I choose, and in which I delight. And take hold of my covenant - Hold fast, or…”

“Take hold - That stedfastly keep the conditions of my covenant. Isaiah 56:5”

“56:4 The Sabbath is a sign of the covenant (Exod 31:13-17).”

“choose: Jos 24:15; Psa 119:111; Luk 10:42 take hold: Isa 27:5, Isa 55:3; Sa2 23:5; Jer 50:5; Heb 6:17 Isaiah 56:5”

“"For thus saith Jehovah to the circumcised, Those who keep my Sabbaths, and decide for that in which I take pleasure, and take fast hold of my covenant; I give to them in my house and within my walls a memorial and a name better than sons and daughters: I give such a man an everlasting name, that shall not be cut off." The second condition after the sanctification of the Sabbath has reference to the regulation of life according to the revealed will of God; the third to fidelity with regard to the covenant of circumcision. יד also means a side, and hence a place ( Deu 23:13); but in the passage before us, where ושׁם יד form a closely connected pair of words, to which וּמבּנות מבּנים is…”