SALAAT UL-AWABEEN
Prophet Muhammad ﷺ said, 'whoever offers a prayer between the Magrib and Isha prayer, it is called the Awabeen Namaaz'. (Ibne Mubarak, el-Raqaik)
Salaat Ul-Awabeen is six rakaats supererogatory (Nafil) Namaaz performed after Magrib Namaaz in three sets of two rakaat each.
Prophet Muhammad ﷺ said, 'Whoever performs six rakaats after Magrib and does not say anything bad in between them, will have a reward equal to the worship of twelve years'. (Tirmidhi)