Abdullah bin Salamah al-Muradi said that a man asked Sayyiduna Ali (may Allah be pleased with him): What is the meaning of the saying of Allah Almighty: "And complete the Hajj and Umrah for Allah" [Surah al-Baqarah: 196]? He replied: It means that you enter ihram from your own home.
This has also been narrated as marfu' (from the Prophet) through Abu Salamah from Abu Hurayrah, and there is reservation about it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8928