A man who saw Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: He prayed Fajr, then sat and did not get up for any prayer until the call to prayer for Zuhr was given; then he stood and prayed four rak'ahs.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9252