It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: After the Iqamah has been called, there is no prayer except the obligatory prayer of that time.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10874
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد قوي، م: 710