Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) was asked about Laylat al-Qadr (the Night of Decree), and he (peace and blessings be upon him) said: "Which of you remembers the night of the 'Sahbawat'?" Sayyiduna Abdullah (may Allah be pleased with him) said: May my father and mother be ransomed for you, O Messenger of Allah! I remember it, when the moon had risen, and that was the twenty-seventh night.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10251