Ruling on the spell heroism

[Sir cryosin]

The spell says it give you temp hit point equal to the caster spell mod every turn. So if caster has +5 mod he cast it on me I go 3 turn not getting hit will I have 15 or 5 temp hit points?

[Lost in Hyrule]

5. Temporary hit points don't stack. Whenever you receive temporary hitpoints, you can take the amount you're given, or keep your previous amount.

[Foxhound438]

PHB 198 tells you the specific rule.