Yazid bin Abi Habib said: I heard Abu al-Khayr say: I saw Abu Tamim al-Jayshani (Abdullah bin Malik) offering two rak'ahs after hearing the adhan of Maghrib. I came to Uqbah bin Amir al-Juhani (may Allah be pleased with him) and said: It amazed me that Abu Tamim prays two rak'ahs before Maghrib. Uqbah (may Allah be pleased with him) said: We used to pray them in the time of the Prophet (peace and blessings be upon him). I said: Then what has stopped you now? He said: Being busy.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4495