耶和华对受惩治之子民爱的应许
耶和华爱的应许乃是赦免和复兴的应许。论到赦免的应许，耶和华首先发出邀请：“来罢，让我们彼此辩论。”神邀请百姓就着他们的罪与祂辩论。
耶和华藉着洗濯而赦免
邀请之后接着就是藉着洗濯而赦免。以赛亚一章十八节下半说到这事。“你们的罪虽像朱红，必变白如雪，虽红如丹颜，必白如羊毛。”虽然祂的子民如此罪恶，但神仍乐意赦免他们。
百姓听从的结果
在一章十九至二十节，我们看见百姓听从的结果。他们若甘心听从，就必吃地上的美物；但他们若不听从，反倒悖逆，就必被刀剑吞灭。
新约里罪的赦免和洗涤
在神完满的救恩里，祂不仅赦免我们的罪，使我们免去罪的刑罚，除去我们在祂面前的罪案；祂也洗去我们里面罪的痕迹，使我们变白如雪，白如羊毛。雪和羊毛在性质上都是白的。因此，我们蒙神洗净的结果，不仅是成为白的，更是在性质上成为白的，如同未曾被玷污一样。
使我们变白如雪的洗，乃是乃是藉着耶稣基督的血（约壹一7，来一3下，启一5），在外面地位上的洗；而使我们白如羊毛的洗，乃是藉着神的灵，并藉着祂的生命（林前六11，多三5），在里面性质上新陈代谢的洗。
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Forgiveness and Washing of Sins – Isa. 1:18
Jehovah’s Loving Promise to His Chastised People
Jehovah’s loving promise is a promise of forgiveness and of restoration. Concerning the promise of forgiveness, Jehovah first extends an invitation: “Come now and let us reason together” (1:18a). God invites the people to reason with him about their sins.
Jehovah’s Forgiveness through Washing
The invitation is followed by Jehovah’s forgiveness through washing. Isaiah speaks of this in 1:18b. “Though your sins are like scarlet, / They will be as white as snow; / Though they are as red as crimson, / They will be like wool.” Although his people were so sinful, God was willing to forgive them.
The Issue of the People’s Obedience
In 1:19 and 20 we have the issue of the people’s obedience. If they were willing and listened, they would eat the good of the land. But if they refused and rebelled, they would be devoured by the sword.
The Forgiveness and Washing of Sins in the New Testament
In God’s full salvation he not only forgives our sins, exempting us from the penalty of our sins and removing the record of our sins from before him; he also washes away the traces of sins in us, making us as white as snow and white like wool. Both snow and wool are naturally white. Hence, as a result of God’s washing, we become not only white but also naturally white, as if we had never been defiled.
The washing that makes us as white as snow is a positional washing from without through the blood of Jesus Christ (1 John 1:7; Heb. 1:3b; Rev. 1:5), whereas the washing that makes us white like wool is a washing of our nature metabolically from within by God’s Spirit and by his life.