It’s based on the Bible readings recommended by the interdenominational scheme followed by many churches and chapels of different affiliations.
These are the readings, with links:
Exodus 3:1-15 — A flaming bush attracts Moses to meet with God
Matthew 16:21-28 — Jesus explains that His call is to suffer and die
Romans 12:9-21 — The call is to show God's life by sacrificial love
The NIV readings are together on this page:
https://thelivingword.uk/bible-readings-for-sept-3-2023/
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Disciples Accept the Cost... but God Says "I am with you!"