"And if shall come to pass afterward, that I will poor out my spirit upon all flesh; and your sons and your daughters shall prophecy, your old men shall dream dreams, your young men shall see visions: And also upon the servants and upon the handmaids in those days will I pour out my spirit. And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come. And it shall come to pass, that whosoever shall call on the name of the LORD shall be delivered: for in mount Zion an in Jerusalem shall be deliverance, as the LORD hath said, and in the remnant whom the LORD shall call." - Joel 2:28-32
The following sermons are on Joel 2:32:
A Full Grace Promise: Whosoever Shall Call on the Name of the Lord Shall Be Saved, by Pastor Charles Haddon Spurgeon (1834-1892)
A Diamond in the Dark, by Dr. Ian Brown
Duty Bound to Join the Church, by Rev. Henk Bergsma