Hadith 1194
It is narrated from Sayyiduna Hudhaifah (may Allah be pleased with him) that he offered the Maghrib prayer with the Prophet (peace and blessings of Allah be upon him), then the Prophet (peace and blessings of Allah be upon him) continued to offer voluntary prayers until he (peace and blessings of Allah be upon him) performed the ‘Isha prayer.
Hadith 1195
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever offers six units of voluntary prayer after the Maghrib prayer, and does not engage in any conversation between them except the remembrance of Allah, then these units will be equal to twelve years of worship for him." In the narration of Janab al-Rabali, the words are: "He offers the prayer without saying anything bad between them."