Prayer: Going Back into Sajdah When the Imam Has Raised His Head
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1453
If someone inadvertently raises his head from sajdah before the imam and goes back into sajdah, and then he realises that the imam had raised his head before he went into sajdah, his prayer is valid. However, if this happens in both sajdahs, then based on obligatory precaution, his prayer is invalid.