It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that a man from the tribe of Juhaynah said: O Messenger of Allah, we are people who live in distant settlements, as you know, and we are not able to be present (in Madinah) for this whole month, so inform us about the Night of Decree. (The narrator says:) I said: O Messenger of Allah, is it the twenty-third night, when eight nights remain (before the month ends)? He (peace and blessings be upon him) said: "It is not so; this month can also fall short (that is, sometimes it has twenty-nine days), and it (the Night of Decree) is the night when seven nights remain."
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصيام / 1124
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف. » «أخرجه الأحاديث المختارة برقم: 2601، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 2379»