1 Corinthians 3:11

For other foundation can no man lay
Men may attempt to lay other foundations than Christ, and build upon them, but to no purpose; they will be of no avail; all besides him are sandy foundations; such as fleshly privileges, a carnal descent, a religious education, an external profession of religion, a man's own righteousness, and the absolute mercy of God; but men ought to lay no other, nor can they, that will be of any advantage to themselves or others:

than that which is laid;
by Jehovah the Father, both in his eternal counsels and covenant, when he set forth and appointed Christ to be the Saviour and Redeemer of his people; and in the fulness of time, when he sent him forth under the same characters; and by the Spirit of God, when he reveals Christ to them, and forms him in them; and by the ministers of the Gospel, who jointly agree to lay him ministerially, as the foundation for souls to build their hope upon: hence he is called the "foundation of the apostles and prophets", as here,

which is Jesus Christ;
he is the foundation personally considered, as God-man and Mediator, on which the church, and every believer is built; he is the foundation of the covenant of grace, and of eternal salvation; of the faith and hope, peace, joy, and comfort of all the saints; and of the building of God, that house not made with hands, that city which has foundations, eternal glory in the other world; and he is the foundation, doctrinally considered; or the doctrines of his proper, deity, of his divine and eternal sonship, of his incarnation, of his Messiahship, of his obedience, sufferings, death, and resurrection from the dead, of justification by his righteousness, pardon by his blood, and atonement by his sacrifice, &c. are fundamental ones: the Jews were wont to call the principal articles of their religion, (ydwoy) , "foundations": Maimondes has entitled one of his tracts, (hrwth ydwoy) "the foundations of the law"; but the doctrines respecting the person, offices, and grace of Christ, are the only foundation of the Gospel.