Purity: Timing of Salat al‑Mayyit

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 584:

Salat al‑mayyit must be performed after giving ghusl, camphorating, and shrouding. If it is performed before or while performing these – albeit forgetfully or on account of not knowing the ruling – it is not sufficient.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)