Sahih Bukhari 618

Narrated `Aisha: The Prophet (ﷺ) used to offer two light rak`at between the Adhan and the Iqama of the Fajr prayer...

Narrated `Abdullah bin `Umar: Allah's Messenger (ﷺ) said, Bilal pronounces the Adhan at night, so keep on eating and drinking (Suhur) till Ibn Um Maktum pronounces the Adhan. ..

Narrated `Abdullah bin Mas`ud: The Prophet (ﷺ) said, The Adhan pronounced by Bilal should not stop you from taking Suhur, for he pronounces the Adhan at night, so that the one offering the late night prayer (Tahajjud) from among you might hurry..

Narrated `Aisha: The Prophet (ﷺ) said, Bilal pronounces the Adhan at night, so eat and drink (Suhur) till Ibn Um Maktum pronounces the Adhan...

Narrated `Aisha: The Prophet (ﷺ) said, Bilal pronounces the Adhan at night, so eat and drink (Suhur) till Ibn Um Maktum pronounces the Adhan. ..

Narrated `Abdullah bin Mughaffal Al-Muzani: Allah's Apostle said thrice, There is a prayer between the two Adhans (Adhan and Iqama), and added, For the one who wants to pray. ..