2. They are charged, and legally charged, to go on with their work, so as thereby to be discharged from the prohibition which the high priest laid them under; the angel bade them, Go, stand, and speak in the temple to the people all the words of this life, v. 20. When they were miraculously set at liberty, they must not think it was that they might save their lives by making their escape out of the hands of their enemies. No; it was that they might to on with their work with so much the more boldness. Recoveries from sickness, releases out of trouble, are granted us, and are to be looked upon by us as granted, not that we may enjoy the comforts of our life, but that God may be honoured with the services of our life. Let my soul live, and it shall praise thee, Ps 119 175. Bring my soul out of prison (as the apostles here), that I may praise thy name, Ps 143 7. See Isa 38 22. Now in this charge given them, observe, (1.) Where they must preach: Speak in the temple. One would think, though they might not quit their work, yet it had been prudent to go on with it in a more private place, where it would give less offence to the priests than in the temple, and so would the less expose them. No; "Speak in the temple, for this is the place of concourse, this is your Father's house, and it is not to be as yet quite left desolate." It is not for the preachers of Christ's gospel to retire into corners, as long as they can have any opportunity of preaching in the great congregation. (2.) To whom they must preach: "Speak to the people; not to the princes and rulers, for they will not hearken; but to the people, who are willing and desirous to be taught, and whose souls are as precious to Christ, and ought to be so to you, as the souls of the greatest. Speak to the people, to all in general, for all are concerned." (3.) How they must preach: Go, stand, and speak, which intimates, not only they must speak publicly, stand up and speak, that all may hear; but that they must speak boldly and resolutely: Stand and speak; that is, "Speak it as those that resolve to stand to it, to live and die by it." (4.) What they must speak: All the words of this life. This life which you have been speaking of among yourselves, referring perhaps to the conferences concerning heaven which they had among themselves for their own and one another's encouragement in prison: "Go, and preach the same to the world, that others may be comforted with the same comforts with which you yourselves are comforted of God." Or, "of this life which the Sadducees deny, and therefore persecute you; preach this, though you know it is this that they have indignation at." Or, "of this life emphatically; this heavenly, divine life, in comparison with which the present earthly life does not deserve the name." Or, "these words of life, the very same you have preached, these words which the Holy Ghost puts into your mouth." Note, The words of the gospel are the words of life, quickening words; they are spirit, and they are life; words whereby we may be saved—that is the same with this here, ch. 11 14. The gospel is the word of this life, for it secures to us the privileges of our way as well as those of our home, and the promises of the life that now is as well as of that to come. And yet even spiritual and eternal life are brought so much to light in the gospel that they may be called this life; for the word is nigh thee. Note, The gospel is concerning matters of life and death, and ministers must preach it and people hear it accordingly. They must speak all the words of this life, and not conceal any for fear of offending, or in hope of ingratiating themselves with their rulers. Christ's witnesses are sworn to speak the whole truth.

Matthew Henry Commentary on the Whole Bible (Concise) (Matthew Henry)

Verses 17-25 There is no prison so dark, so strong, but God can visit his people in it, and, if he pleases, fetch them out. Recoveries from sickness, releases out of trouble, are granted, not that we may enjoy the comforts of life, but that God may be honoured with the services of our life. It is not for the preachers of Christ's gospel to retire into corners, as long as they can have any opportunity of preaching in the great congregation. They must preach to the lowest, whose souls are as precious to Christ as the souls of the greatest. Speak to all, for all are concerned. Speak as those who resolve to stand to it, to live and die by it. Speak all the words of this heavenly, divine life, in comparison with which the present earthly life does not deserve the name. These words of life, which the Holy Ghost puts into your mouth. The words of the gospel are the words of life; words whereby we may be saved. How wretched are those who are vexed at the success of the gospel! They cannot but see that the word and power of the Lord are against them; and they tremble for the consequences, yet they will go on.