It is narrated from Sayyidah Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) used to perform two rak'ahs between the call to Fajr prayer (adhan) and the commencement (iqamah).
Hadith Referenceالفتح الربانی / أبواب الأذ كار الواردة عقب الصلاة / 2106
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«أخرجه البخاري: 619، ومسلم: 724 ، (انظر مسند أحمد ترقيم الرسالة: 24517، 24262 ترقیم بيت الأفكار الدولية: 25022»
Brief Explanation
Benefits: … It is understood that immediately after the call to prayer (adhan) for Fajr, and with brevity, the Sunnah prayers of Fajr should be performed. In any case, these Sunnah prayers can be offered at any time between the adhan and the iqamah.