Romans 10:9

“That if thou shalt confess with thy mouth the Lord Jesus, etc..] That is, if a man shall make a good, sincere, and hearty confession to God, before the church and people of God, and before the world, that Christ is his Lord and Saviour, whom he desires to serve, and to be saved by; and this as arising from a comfortable experience of the grace of God in his soul, and from a true faith in Christ in his heart, wherefore it follows, and shall believe in thine heart, that God hath raised him from the dead, thou shalt be saved; for this article of Christ's resurrection includes the several other articles of faith: it supposes his death, and that supposes his life, and the obedience of it; and his…”

“That if thou shalt, &c.--So understanding the words, the apostle is here giving the language of the true method of justification; and this sense we prefer (with CALVIN, BEZA, FERME, LOCKE, JOWETT). But able interpreters render the words, "For," or "Because if thou shalt," &c. [Vulgate, LUTHER, DE WETTE, STUART, PHILIPPI, ALFORD, Revised Version]. In this case, these are the apostle's own remarks, confirming the foregoing statements as to the simplicity of the gospel method of salvation. confess with thy mouth the Lord Jesus--that is, probably, "If thou shalt confess Jesus [to be] the Lord," which is the proper manifestation or evidence of faith (Mat 10:32; Jo1 4:15). This is put first merely…”

“That if thou shalt confess - The word here rendered “confess” ὁμολογέω homologeō is often rendered “profess”; Matthew 7:23, “Then will I profess to them, I never knew you;” Titus 1:16; Titus 3:14; Romans 1:22; 1 Timothy 2:10; 1Ti 6:12-13, 1 Timothy 6:21; Hebrews 3:1, etc. It properly means to “speak what agrees with something which others speak or maintain.” Thus, confession or profession expresses our “agreement or concord with what God holds to be true, and what he declares to be true.” It denotes a public declaration or assent to that, here expressed by the words “with thy mouth.” A profession of religion then denotes a public declaration of our agreement with what God has declared,…”

“If thou confess with thy mouth - Even in time of persecution, when such a confession may send thee to the lions. Romans 10:10”

“That if: Rom 14:11; Mat 10:32, Mat 10:33; Luk 12:8; Joh 9:22, Joh 12:42, Joh 12:43; Phi 2:11; Jo1 4:2, Jo1 4:3; Jo2 1:7 and shalt: Rom 8:34; Joh 6:69-71, Joh 20:26-29; Act 8:37; Co1 15:14-18; Pe1 1:21 Romans 10:10”