What is the ruling on delaying the 'Isha prayer due to a lecture held between Maghrib and 'Isha, and is it obligatory to interrupt the lecture at the time of the Adhan, and what is the ruling on calling the Adhan or Iqamah after the time of the Adhan has passed, or sufficing with the Iqamah, and what is the ruling on sitting for communal Tasbih and shaking hands after the prayer, and is it obligatory to leave immediately after the prayer if these matters are Bid'ah, and what is the ruling on accepting edible gifts from Chinese or Iranians (Majus) during their pagan celebrations?

It is permissible to delay the Isha prayer beyond its initial time for a lecture to conclude, as long as the delay does not cause hardship for the worshippers or lead to the prayer being performed outside its prescribed time. It is permissible to delay the adhan until the prayer time, but it is preferable to perform the adhan at the very beginning of the time. If the Imam enters a mosque where the adhan has not been called, he may perform the iqama and pray without an adhan, because the adhan is a communal obligation (fard kifaya). Group tasbih is a reprehensible innovation (bidah munkarah), and the Sunnah is for each person to perform tasbih individually. Shaking hands after prayer is an innovation (bidah), and those who do it should be advised gently and wisely. It is permissible not to respond to someone who extends their hand for a handshake, along with offering advice. It is permissible to sit after prayer and perform tasbih individually.