Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.105A.
Section : The Time Between the Iqamah and the Prayer.
It is permitted to talk between the iqamah and the prayer. One need not repeat the iqamah, even if the interval is long. Reported Anas ibn Malik, “The iqamah was made while the Messenger of Allah was talking to a man in the corner of the mosque. He did not come to the prayer until the people had fallen asleep.” (Related by al-Bukhari) One time, the Messenger of Allah, upon whom be peace, remembered that he was in post-sex impurity after the iqamah had been made, so he went to make ghusl and came back to lead the prayer without (a new) iqamah.