What specific instance is mentioned by Peter?

Answer

'Men and brethren, this scripture must needs have been fulfilled, which the Holy Ghost by the mouth of
David spoke before concerning Judas, which was guide to them that took Jesus!' Acts 1: 16.

14. What was the next step in their plan to secure lawful authority to carry out their unlawful purpose?
How is the true God distinguished from all false gods?
Can there be sin where there is no law?
18. Does Christ anywhere in the Scriptures ever claim any other day of the week than the seventh as His?
Concerning what should we not be ignorant?
What has the Lord promised to be to the oppressed?
What precious promise has God made to His children?

Questions & Answers are from the book Bible Readings for the Home Circle