Because that by reason of him many of the Jews went away, and believed on Jesus.

People's New Testament

12:10,11 The chief priests consulted. Lazarus was a living proof of the Divine power of Christ, and they wished him out of the way.

Matthew Henry's Concise Commentary

12:1-11 Christ had formerly blamed Martha for being troubled with much serving. But she did not leave off serving, as some, who when found fault with for going too far in one way, peevishly run too far another way; she still served, but within hearing of Christ's gracious words. Mary gave a token of love to Christ, who had given real tokens of his love to her and her family. God's Anointed should be our Anointed. Has God poured on him the oil of gladness above his fellows, let us pour on him the ointment of our best affections. In Judas a foul sin is gilded over with a plausible pretence. We must not think that those do no acceptable service, who do it not in our way. The reigning love of money is heart-theft. The grace of Christ puts kind comments on pious words and actions, makes the best of what is amiss, and the most of what is good. Opportunities are to be improved; and those first and most vigorously, which are likely to be the shortest. To consult to hinder the further effect of the miracle, by putting Lazarus to death, is such wickedness, malice, and folly, as cannot be explained, except by the desperate enmity of the human heart against God. They resolved that the man should die whom the Lord had raised to life. The success of the gospel often makes wicked men so angry, that they speak and act as if they hoped to obtain a victory over the Almighty himself.