Commentaries:
Jamieson, Fausset, and Brown
weeping—for their past sins which caused their exile (Psalms 126:5-6). Although they come with weeping, they shall return with joy (Jeremiah 50:4-5).
supplications—(Compare Jeremiah 31:18-19; Jeremiah 3:21-25; Zechariah 12:10). Margin translates "favors," as in Joshua 11:20; Ezra 9:8; thus God's favors or compassions are put in opposition to the people's weeping; their tears shall be turned into joy. But English Version suits the parellelism best.
I will cause . . . to walk by . . . waters . . . straight way— (Isaiah 35:6-8; Isaiah 43:19; Isaiah 49:10-11). God will give them waters to satisfy their thirst as in the wilderness journey from Egypt. So spiritually (Matthew 5:6; John 7:37).
Ephraim—the ten tribes no longer severed from Judah, but forming one people with it.
my first-born— (Exodus 4:22; Hosea 11:1; Romans 9:4). So the elect Church (II Corinthians 6:18; James 1:18).
Other Jamieson, Fausset, and Brown entries containing Jeremiah 31:9:
Psalms 126:6
Jeremiah 50:4
Joel 2:28
Zechariah 12:10
Romans 9:4
2 Corinthians 6:18
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