This Shabbat is a time of repentance and returning to the ways of the Lord.
Deuteronomy 32; Hosea 14:2-10 (1-9 in Christian Bibles); Micah 7:18-20; Matthew 7:18-20.
Chabad article: https://www.chabad.org/parshah/article_cdo/aid/3786534/jewish/Shabbat-Shuvah-Haftarah-Companion.htm
* The Atonement chapter is Leviticus 16 not 19.