Prayer: Adhan and Iqamah After a Congregational Prayer
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 910
If a person goes to the mosque to perform prayers and finds that congregational prayers are over, he does not have to say adhan and iqamah for his own prayers as long as the rows have not broken up and the people have not dispersed; in other words, saying them in such a situation is not an emphasised recommended act. In fact, if he wants to say adhān, it is better that he does so in a very low voice. If he wants to establish another congregational prayer, he must not say adhan and iqamah.