Praying before and after Maghrib

Zirr bin Hubaysh narrates that he stayed in the company of Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) and Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him). Zirr stated that when the sun had set, both of them would stand and pray two (voluntary) rak'ahs before the Maghrib prayer.
Abdullah bin Ahmad recorded it in his Zawa'id (additions); its chain contains a narrator, Hammad bin Shu'ayb, who is da'if (weak).

Ubayd, the freed slave of the Prophet (peace and blessings be upon him), was asked about the prayer of the Prophet (peace and blessings be upon him), and he mentioned a prayer between Maghrib and Isha.
Ahmad recorded it.

He also recorded another report from him: he was asked: "Did the Prophet (peace and blessings be upon him) instruct to offer any prayer after the obligatory prayer, or apart from the obligatory prayer?" He replied: "Yes, between Maghrib and Isha (he instructed to offer prayer)."
Ahmad, and al-Tabarani in al-Mu'jam al-Kabir, recorded it. All of its routes revolve around a man who is not named, and Ahmad's remaining narrators are the narrators of the Sahih.

Sayyiduna Mahmud bin Labid (may Allah be pleased with him), who belonged to Banu Abd al-Ashhal, said: The Prophet (peace and blessings be upon him) came to us in our mosque and led us in the Maghrib prayer. When he had said the salam at the end of the prayer, he said: "Pray these two rak'ahs in your homes." The Prophet (peace and blessings be upon him) said this about the voluntary prayer (that is, the sunnah) after Maghrib.
Ahmad recorded it, and its narrators are thiqat (trustworthy). Abdullah said: I said to my father (Imam Ahmad bin Hanbal): "A man has said: Whoever prays two rak'ahs in the mosque after Maghrib, his prayer is not valid; he must pray them in his home, because the Prophet (peace and blessings be upon him) said: 'This is one of the prayers of the home.'" Imam Ahmad asked: "Who said this?" I replied: "Muhammad bin Abd al-Rahman." He said: "How well he has spoken!" (the narrator is in doubt; perhaps the words are:) "How good is what he has transmitted, and how good is the ruling he has derived!"

Muhammad bin Ammar bin Yasir said: (the narrator says:) My father reported from my grandfather; he said: I saw Sayyiduna Ammar bin Yasir (may Allah be pleased with him) praying six rak'ahs after Maghrib. I asked: "O dear father! What prayer is this?" He replied: "I saw my beloved, the Messenger of Allah (peace and blessings be upon him), praying six rak'ahs after Maghrib, and he (peace and blessings be upon him) said: 'Whoever prays six rak'ahs after Maghrib, his sins are forgiven, even if they are like the foam of the sea.'"
Al-Tabarani recorded it in all three of his books and said: "Salih bin Qatan al-Bukhari is alone in reporting it." (Allamah al-Haythami says:) I say: I have not found anyone who gives his biography.

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) used to pray two rak'ahs after Maghrib in which he would prolong the recitation, until the people of the mosque dispersed.
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Yahya bin Abd al-Hamid al-Himmani, who is da'if (weak).

Al-Aswad bin Yazid said: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "The best hour of heedlessness is the time between Maghrib and Isha." (What he meant was that at this time people are heedless, and it is the best time for praying.)
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Jabir al-Ju'fi, about whom there is much criticism.

Abd al-Rahman bin Yazid said: There is an hour in which, whenever I came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), I found him praying in that hour; he would keep praying between Maghrib and Isha. I asked Sayyiduna Abdullah (may Allah be pleased with him), saying: "There is an hour in which, whenever I have come to you, I have found you praying in it." He said: "It is an hour of heedlessness (so I keep praying during it)."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Layth bin Abi Sulaym, about whom there is criticism.

Imam Abu Ja'far Muhammad bin Ali (that is, Imam al-Baqir) said: We said to Sayyiduna Abdullah bin Ja'far (may Allah be pleased with him): "Narrate to us a hadith that you heard from the Prophet (peace and blessings be upon him) yourself and in which you saw the Prophet (peace and blessings be upon him) yourself, and do not narrate to us from anyone other than yourself, even if that other person is thiqah (trustworthy)." (The narrator said:) So he mentioned the whole hadith, in which, further on, are these words: "The Prophet (peace and blessings be upon him) used to recite Surah al-Kafirun and Surah al-Ikhlas in the two rak'ahs before Fajr and in the two rak'ahs (sunnah) after Maghrib."
Al-Tabarani recorded it in al-Mu'jam al-Awsat as part of a long hadith that will come later in the chapter on virtues (manaqib), if Allah wills. Its chain contains a narrator, Asram bin Hawshab, who is matruk (abandoned).