The same narration is transmitted from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) with another chain of transmission; however, in it are these words: "Witr is one rak'ah, so create a separation between two and one."
Hadith Referenceسنن الدارقطني / كتاب الوتر / 1678
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 1677، 1678»