Purity: Timing of Salat al‑Wahshah

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 628:

Salat al‑wahshah can be performed at any time on the first night of burial. However, it is better to perform it at the start of the evening after ʿishāʾ prayers.

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