Musannaf Ibn Abi Shaybah 8905 — Laylat al-Qadr and which night it is

Qannan bin Abdullah al-Nahmi said: I asked Zirr about Laylat al-Qadr. He said: "Sayyiduna Umar, Sayyiduna Hudhayfah (may Allah be pleased with them both) and many of the Companions had no doubt that Laylat al-Qadr is the 27th night of Ramadan, when three nights remain." Zirr said: "So keep at it continuously."