'Sound Instruction' in the Bible

Any one who teaches otherwise, and refuses his assent to sound instruction--the instruction of our Lord Jesus Christ--and to the teaching of religion,

Model yourself on the sound instruction you have had from me in the faith and love of Christ Jesus.

for the time will come when they will not endure sound instruction, but will accumulate for themselves teachers according to their desires, pleasing their ear,

holding fast to the faithful message according to the teaching, in order that he may be able both to exhort with sound instruction and to reprove those who speak against [it].

But you, speak [the things] which are fitting for sound instruction.