The Prophet (peace and blessings be upon him) said:
"Between every two calls (that is, the adhan and the iqamah) there is a prayer, for whoever wishes to offer it."
Hadith Referenceصحیح الجامع الصغیر / حرف الباء / 2850
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[حم ق ٤] عن عبد الله بن مغفل. مختصر مسلم ٣٧١، صحيح أبي داود ١١٦٣.