Sunan an Nasai
1768
Sahih+2

It was narrated from Abu Salamah and Nafi', from Ibn Umar, from Hafsah that:The Prophet (ﷺ) used to pray two brief rak'ahs between the call (The adhan) and the Iqamah, the two rak'ahs of Fajr

SahihAbu Ghuddah
SahihAl-Albani