It is narrated from Sayyiduna al-Bara' bin Azib (may Allah be pleased with him): For a period we recited it with the Messenger of Allah (peace and blessings be upon him) like this: "Guard the prayers, and especially the Asr prayer." Then, after it was abrogated, we recited it like this: "Guard the prayers, especially the middle prayer." [Surah al-Baqarah: 238] I do not know whether it is that same prayer or another one.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2159