Jamieson, Fausset & Brown

abide--abide the testing fire (Mat 3:11-12). which he hath built thereupon--which he built on the foundation. reward--wages, as a builder, that is, teacher. His converts built on Christ the foundation, through his faithful teaching, shall be his "crown of rejoicing" (Co2 1:14; Phi 2:16; Th1 2:19).