Prayer: Uncertainty About Which Four Rakʿah Prayer Was Missed
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1362
With regard to someone who knows he has not performed a four rakʿah prayer but does not know whether it was ẓuhr or ʿishāʾ prayers, if he performs a four rakʿah prayer with the intention of making up the prayer that he did not perform, it is sufficient; moreover, he has the option of reciting Sūrat al-Ḥamd and the other surah aloud or in a whisper.