Therefore also now, saith the LORD, turn ye even to me with all your heart, and with fasting, and with weeping, and with mourning:(Joel 2:12)

And rend your heart, and not your garments, and turn unto the LORD your God: for he is gracious and merciful, slow to anger, and of great kindness, and repenteth him of the evil.(Joel 2:13)

Who knoweth if he will return and repent, and leave a blessing behind him; even a meat offering and a drink offering unto the LORD your God?(Joel 2:14)

Blow the trumpet in Zion, sanctify a fast, call a solemn assembly:

Gather the people, sanctify the congregation, assemble the elders, gather the children, and those that suck the breasts: let the bridegroom go forth of his chamber, and the bride out of her closet.(Joel 2:16)

Let the priests, the ministers of the LORD, weep between the porch and the altar, and let them say, Spare thy people, O LORD, and give not thine heritage to reproach, that the heathen should rule over them: wherefore should they say among the people, Where is their God?(Joel 2:17)

Then will the LORD be jealous for his land, and pity his people.(Joel 2:18)

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Joel 2:15 - Cross Reference

And she wrote in the letters, saying, Proclaim a fast, and set Naboth on high among the people: (1 Kings 21:9)

And when they shall blow with them, all the assembly shall assemble themselves to thee at the door of the tabernacle of the congregation. (Numbers 10:3)

And it came to pass in the fifth year of Jehoiakim the son of Josiah king of Judah, in the ninth month, that they proclaimed a fast before the LORD to all the people in Jerusalem, and to all the people that came from the cities of Judah unto Jerusalem. (Jeremiah 36:9)

Sanctify ye a fast, call a solemn assembly, gather the elders and all the inhabitants of the land into the house of the LORD your God, and cry unto the LORD, (Joel 1:14)

And Jehu said, Proclaim a solemn assembly for Baal. And they proclaimed it. (2 Kings 10:20)

They proclaimed a fast, and set Naboth on high among the people. (1 Kings 21:12)

Blow ye the trumpet in Zion, and sound an alarm in my holy mountain: let all the inhabitants of the land tremble: for the day of the LORD cometh, for it is nigh at hand; (Joel 2:1)