Jeremiah 33:3 (BSB)

Call to Me, and I will answer and show you great and unsearchable things you do not know.

From Jeremiah 33. Also in the ESV.

Commentary on Jeremiah 33:3

• John Calvin (Reformed), Calvin's Commentaries on Jeremiah 33:3: He afterwards adds, Cry to me, and I will answer thee, and I will announce to thee things magnificent and recondite, which thou hast not known It was not so much for the sake of the Prophet as of others that this was said. For the Prophet, no doubt, had earnestly prayed, and his prison must have inflamed his ardor, so as to intercede constantly with God.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Jeremiah 33:1-9: Observe here, I. The date of this comfortable prophecy which God entrusted Jeremiah with. It is not exact in the time, only that it was after that in the foregoing chapter, when things were still growing worse and worse; it was the second time. God speaketh once, yea, twice, for the encouragement of his people.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Jeremiah 33:3: Call unto me, and I will answer thee,.... This is spoken not to Jerusalem, and the inhabitants of it; but to the prophet, encouraging him to seek the Lord by prayer, promising an answer to him. So the Targum, "pray before me, and I will receive thy prayer:'' and show thee great and mighty things; or, "fortified ones" (p); which are like fortified cities, that...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Jeremiah 33:3: Call . . . I will answer-- (Jer 29:12; Psa 91:15). Jeremiah, as the representative of the people of God, is urged by God to pray for that which God has determined to grant; namely, the restoration. God's promises are not to slacken, but to quicken the prayers of His people (Psa 132:13, Psa 132:17; Isa 62:6-7).