Albert Barnes Commentary Acts 4:29

"And now, Lord, look upon their threatenings: and grant unto thy servants to speak thy word with all boldness," — Acts 4:29 (ASV)

Behold their threatenings. So look upon them in such a way as to grant us deliverance. They did not intend to abandon their undertaking; they resolved to persevere, and they expected that this resolve would involve them in danger. With this resolve, they implored the protection of God; they asked that He would not allow them to be deterred from speaking boldly, and they sought that constant additional proof might be granted of the presence and power of God to confirm the truth of their message.

And grant, etc. This is an instance of heroic boldness and a determination to persevere in doing their duty to God. When we are assailed by those who wield harmful power, when we are persecuted and in danger, we should commit our way to God and seek His aid, that we may not be deterred from the path of duty.