Psalms 16:4

“Their sorrows shall be multiplied, etc.] Not the sorrows of the saints and excellent ones, by seeing the idolatry of men, as Aben Ezra interprets it; but the sorrows of such [that] hasten [after] another [god]; a false god, an idol, to serve and worship it; for, generally speaking, idolaters are more forward, eager, and hasty to attend a false worship, than the worshippers of the true God are to attend his service: now their sorrows are many, even in their worship, by cutting their bodies with knives and lancets, as the worshippers of Baal did; and by sacrificing their own children, which, notwithstanding their rash and precipitate zeal, could not fail of giving them pain and uneasiness;…”

“He expresses his abhorrence of those who seek other sources of happiness or objects of worship, and, by characterizing their rites by drink offerings of blood, clearly denotes idolaters. The word for "sorrows" is by some rendered "idols"; but, though a similar word to that for idols, it is not the same. In selecting such a term, there may be an allusion, by the author, to the sorrows produced by idolatrous practices.”

“Their sorrows shall be multiplied - The word here rendered “sorrows - עצבוּת ‛atstsebôth - may mean either idols or sorrows. Compare Isaiah 48:5; Psalms 139:24; Job 9:28; Psalms 147:3. Some propose to render it, “Their idols are multiplied;” that is, many are the gods which others worship, while I worship one God only. So Gesenius understands it. So also the Aramaic Paraphrase renders it. But the common construction is probably the correct one, meaning that sorrow, pain, anguish, must always attend the worship of any other gods than the true God; and that therefore the psalmist would not he found among their number, or be united with them in their devotions. That hasten after another god -…”

“Sorrows - Having shewed his affection to the servants of the true God, he now declares what an abhorrency he has for those that worship idols. Offerings - In which the Gentiles used sometimes to drink part of the blood of their sacrifices. Names - Of those other gods mentioned before. Psalms 16:5”

“16:4 The psalmist dissociates himself from ungodly worship, rituals, and words (see 15:3-5).”

“Their: Psa 32:10, Psa 97:7; Jon 2:8; Rev 14:9-11, Rev 18:4, Rev 18:5 hasten: etc. or, give gifts to another drink: Gen 35:14; Lev 23:13; Isa 57:6, Isa 65:11, Isa 66:3; Jer 7:18 take: Exo 23:13; Jos 23:7; Hos 2:16, Hos 2:17 Psalms 16:5”

“As he loves the saints so, on the other hand, he abhors the apostates and their idols. אהר מהרוּ is to be construed as an appositional relative clause to the preceding: multi sunt cruciatus (cf. Psa 32:10) eorum, eorum scil. qui alium permutant. The expression would flow on more smoothly if it were ירבּוּ: they multiply, or increase their pains, who..., so that אחר מהרו would be the subject, for instance like אהבו ה (he whom Jahve loves), Isa 48:14. This Psa 16:4 forms a perfect antithesis to Psa 16:3. In David's eyes the saints are already the glorified, in whom his delight centres; while, as he knows, a future full of anguish is in store for the idolatrous, and their worship, yea, their…”