Musannaf Ibn Abi Shayba 4:571

Ibn Fudayl narrated to us, from ‘Umar ibn Dharr, who said: Hanzalah ibn Sabrah ibn al-Musayyib ibn Najbah al-Fazari informed us, from his paternal aunt, Jumana (Humana) bint al-Musayyib, who was married to Hudhayfah ibn al-Yaman. When he would pray the dawn prayer (Fajr) in Ramadan, he would enter under her quilt with her, and he would turn his back to her, seeking warmth from being near her, and he would not turn toward her.