وَيَزِيدُ فِي أَذَانِ الْفَجْرِ بَعْدَ الْفَلَاحِ: الصَّلَاةُ خَيْرٌ مِنَ النَّوْمِ مَرَّتَيْنِ
Translation: In the Fajr adhan he adds “Prayer is better than sleep” twice after “hayya ‘ala al-falah.”
The Fajr addition is “al-salatu khayrun min al-nawm,” repeated twice.
It occurs after the invitations to prayer and success. It is specific to Fajr and is not a general addition to all five calls.