4. Ali ibn Muhammad has narrated from Muhammad ibn Musa from Muhammad ibn ‘Isa from ibn Faddal from Hammad ibn ‘Uthman who has said the following
“Muhammad ibn Hakim narrated to me that he had heard abu al-Hassan (a.s.), say, ‘Performing two Salah (prayer) soon one after the other is when no optional Salah (prayer) is performed between them. When optional Salah (prayer) is performed between them, they are not performed soon one after the other.’”