2 Timothy 2:19

“Nevertheless, the foundation of God standeth sure, etc.] That faith, which is the faith of God's elect, is of the operation of God, and is the gift of his grace, and of which Christ is the author and finisher, is firm and immovable as a foundation; it is solid and substantial; it is the substance of things hoped for; and it is permanent and abiding; it stands sure, being supported by the power of God, and prevalent mediation of Jesus Christ; and so cannot be overthrown by false teachers, when an historical faith, or the faith of temporary believers may: or the doctrine of the resurrection of the dead is here meant, which was said to be past by the above false teachers; which is a fundamental…”

“Nevertheless--Notwithstanding the subversion of their faith, "the firm foundation of God standeth" fast (so the Greek ought to be translated). The "foundation" here is "the Church" [ALFORD], "the ground" or basement support "of the truth" (Ti1 3:15), Christ Himself being the ultimate "foundation" (Co1 3:11). In the steadfast standing of the Church there is involved the steadfast certainty of the doctrine in question (Ti2 2:18). Thus the "house" (Ti2 2:20) answers to the "foundation"; it is made up of the elect whom "the Lord knoweth" (acknowledgeth, recognizes, Psa 1:6; Mat 7:23; Joh 10:14; Co1 8:3) as "His," and who persevere to the end, though others "err concerning the faith" (Mat 24:24;…”

“Nevertheless the foundation of God is sure - Margin, “steady.” The meaning is, that though some had been turned away by the arts of these errorists, yet the foundation of the church which God had laid remained firm; compare Ephesians 2:20, “And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief cornerstone.” As long as this foundation remained firm, there was no reason to be troubled from the few instances of apostasy which had occurred; compare Psalms 11:3. It is not uncommon to compare the church to a building erected on a solid foundation; Ephesians 2:20-21; 1 Corinthians 3:9-10; Matthew 16:18. Having this seal - Or rather a seal with this…”

“But the foundation of God - His truth and faithfulness. Standeth fast - Can never be overthrown; being as it were sealed with a seal, which has an inscription on each side: on the one, The Lord knoweth those that are his; on the other, Let every one who nameth the name of the Lord, as his Lord, depart from iniquity. Indeed, they only are his who depart from iniquity. To all others he will say, "I know you not." Mat 7:22-23 2 Timothy 2:20”

“2:19 Paul assures Timothy that the false teaching will not win (see 3:9), and he reinforces the call to purity. • foundation stone: This metaphor emphasizes immunity to destruction (Isa 28:16) and might reflect a temple (see also 1 Tim 3:15; 1 Cor 3:11; Eph 2:20; 1 Pet 2:4-7; Rev 21:14). • The Lord knows: This quotation alludes to Num 16:5. • All who belong to the Lord must turn away from evil: See Isa 52:11; cp. Num 16:26-27; Lev 24:16; Ps 6:8.”

“the foundation: Pro 10:25; Isa 14:32, Isa 28:16; Mat 7:25; Luk 6:48; Co1 3:10, Co1 3:11; Eph 2:20; Ti1 6:19; Heb 11:10; Rev 21:14 standeth: Mat 24:24; Mar 13:22; Rom 8:31-35, Rom 9:11; Heb 6:18, Heb 6:19; Jo1 2:19 sure: or, steady, Psa 112:6, Psa 125:1, Psa 125:2 having: Hag 2:23; Zac 3:9, Zac 4:7-9; Eph 4:30 The Lord: Num 16:5; Psa 1:6, Psa 37:18, Psa 37:28; Nah 1:7; Mat 7:23; Luk 13:27; Joh 10:14; Joh 10:27-30, Joh 13:18; Rom 8:28, Rom 11:2; Co1 8:3; Gal 4:9; Rev 17:8 Let: Num 6:27; Psa 97:10; Isa 63:19, Isa 65:15; Mat 28:19; Act 9:14, Act 11:26, Act 15:17; Rom 15:9, Rom 15:20; Co1 1:2; Eph 3:15; Rev 2:13, Rev 3:8, Rev 22:4 depart: Job 28:28; Psa 34:14, Psa 37:27; Pro 3:7; Rom 12:9; Co2…”