There's a #chiasm in #exodus 15:23 and another one 2 verses down in v25-26.

Exodus 15:23
- A - Came to Marah
-- B - Could not drink the water
---- C - Marah
-- B - Because it was bitter
- A - Named it Marah

Exodus 15:25-26
- A - V25 – Log heals the water
-- B - Water made sweet
---- C - Obey God's statues and rules
------ D - V26 – Listen to God and do what's right
---- C - Obey God's commandments and statutes
-- B - No diseases
- A - A healer sent