Abdullah bin Shaqayq al-Aqayli عبد الله بن شقيق العقيلي · The Book on Salat (Prayer)

"I asked her about the voluntary Salat of Allah's Messenger (S), she said: 'He would pray long into the night standing, and long into the night sitting. So when he recited and he was standing, he would bow and prostrate whole he was standing, and when he recited while he was sitting, he bowed and prostrated while he was sitting.'"

"I prayed two Rak'ah with the Prophet (S) before Az-Zuhr and two Rak'ah after it."

Allah's Messenger (S) said: "Whoever prays six Rak'ah after Al-Maghrib, and he does not speak about anything between them, then they will be counted for him as twelve years of worship."