John 7:5

Neither did his brethren believe in him; by his brethren here, we are to understand his kindred, his townsmen or countrymen, at or about Nazareth. (Witham)

(2.) One would not think there was any harm in this advice, and yet the evangelist noted it is an evidence of their infidelity: For neither did his brethren believe in him (v. 5), if they had, they would not have said this. Observe, [1.] It was an honour to be of the kindred of Christ, but no saving honour; they that hear his word and keep it are the kindred he values. Surely grace runs in no blood in the world, when not in that of Christ's family. [2.] It was a sign that Christ did not aim at any secular interest, for then his kindred would have struck in with him, and he would have secured them first. [3.] There were those who were akin to Christ according to the flesh who did believe in him (three of the twelve were his brethren), and yet others, as nearly allied to him as they, did not believe in him. Many that have the same external privileges and advantages do not make the same use of them. But,

Verses 1-13 The brethren or kinsmen of Jesus were disgusted, when they found there was no prospect of worldly advantages from him. Ungodly men sometimes undertake to counsel those employed in the work of God; but they only advise what appears likely to promote present advantages. The people differed about his doctrine and miracles, while those who favoured him, dared not openly to avow their sentiments. Those who count the preachers of the gospel to be deceivers, speak out, while many who favour them, fear to get reproach by avowing regard for them.