Supererogatory Prayer for the Maghrib Prayer

Q 5: It was reported on the authority of Anas (may Allah be pleased with him) in the Sahih (authentic) Book of Hadith of Imam Muslim that he said: We were in Madinah, and as the Mu'adhin (caller to Prayer) called for Maghrib (Sunset) Prayer, we used to rush to position ourselves behind the pillars (of the mosque), then offer two Rak`ahs (units of Prayers) (supererogatory Prayers). We did this in such a way that if a stranger entered the mosque he would have thought that the (obligatory) Prayer was being observed due to the large number of people offering that (supererogatory) Prayer. Is this an indication that the Sahabah (Companions of the Prophet - may Allah be pleased with them) offered Sunnah Ratibah (supererogatory Prayer performed on a regular basis) before the start of the Maghrib Prayer in the Masjid (mosque), as he likened the large number of those who offer Salah (Prayer) between the Adhan (call to Prayer) and the Iqamah (call to start the Prayer) to the multitude of those who offer the (Part No. 6; Page No. 129) obligatory Salah?

A: It is Mustahab (desirable) to offer Sunnah (supererogatory) Salah after the Adhan of Maghrib Prayer, for the Prophet (peace be upon him) said: Offer (two supererogatory Rak`ahs) before the Magrib Prayer. He repeated this sentence then added, "(This applies) to those who wish to do it." However, this Sunnah Salah is not Ratibah, because the Sunnah Ratibah of Maghrib Prayer is only to be offered after it. Rather, this supererogatory two Rak`ahs before the obligatory Maghrib Prayer comes under the ruling of an absolute Nafilah (supererogatory) Prayer.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.