The phrase "double for all her sins" appears in the context of divine judgment and retribution, particularly in the prophetic literature of the Old Testament. This expression is notably found in the book of Isaiah and is echoed in the book of Revelation, symbolizing the severity and completeness of God's judgment upon those who have persistently rebelled against Him.

Isaiah 40:2
In Isaiah 40:2, the prophet is instructed to speak comfort to Jerusalem, declaring that her warfare is ended, her iniquity is pardoned, and she has received from the LORD's hand "double for all her sins." The Berean Standard Bible renders this verse as follows: "Speak tenderly to Jerusalem and proclaim to her that her hard service has been completed, her iniquity has been pardoned. For she has received from the hand of the LORD double for all her sins."

This passage is often interpreted as a message of hope and restoration. The "double" punishment signifies the full measure of justice that has been meted out, suggesting that the period of suffering and exile has fulfilled its purpose. Theologically, it underscores the concept of divine justice being fully satisfied, allowing for the subsequent comfort and redemption of God's people.

Revelation 18:6
The theme of receiving "double" for sins is revisited in Revelation 18:6, where Babylon, representing a system of worldly corruption and opposition to God, is judged. The BSB states: "Give back to her as she has done to others; pay her back double for what she has done; mix her a double portion in her own cup."

In this apocalyptic context, the "double" recompense serves as a vivid illustration of God's righteous judgment against evil. It reflects the principle of retributive justice, where the punishment corresponds to the magnitude of the sin. The imagery of a "double portion" in her own cup emphasizes the completeness and inevitability of divine retribution.

Theological Implications
The concept of receiving "double for all her sins" highlights several key theological themes:

1. Divine Justice: The phrase underscores the certainty and thoroughness of God's justice. It affirms that God will not overlook sin but will address it in a manner that fully satisfies His righteous standards.

2. Restoration and Redemption: In Isaiah, the notion of receiving "double" also points to the end of punishment and the beginning of restoration. It signifies that once justice is served, God is ready to restore and redeem His people.

3. Moral Accountability: The biblical principle of receiving "double" for one's sins serves as a sobering reminder of moral accountability. It calls individuals and nations to repentance, warning of the consequences of persistent rebellion against God.

4. Hope and Comfort: For the faithful, the message of "double for all her sins" ultimately conveys hope. It assures believers that God's justice will prevail, and His promises of comfort and restoration will be fulfilled.

In summary, the phrase "double for all her sins" encapsulates the dual themes of judgment and hope, reflecting the comprehensive nature of God's dealings with humanity. It serves as both a warning to the unrepentant and a promise of redemption to those who turn back to God.