Forgetting to perform first Qaʻdah (sitting) in Salah
Question: If one stands up from rukuʻ and starts reciting Surah Fatiha, but was meant to sit in Qaʻdah (sitting) [in the second rakʻah], instead, and realises it when he’s reciting Surah Fatiha – then will his Salah become invalid? Or should he go into Qaʻdah immediately once he realizes and resume his prayer from there and