A manasked Ibn 'Umar:
"How should I perform Witr?" He said: "PrayWitr with one Rak'ah." He said: "I am afraid that the peoplewill saythat I am cutting the prayer short." He said: "TheSunnah of Allah andHis Messenger." Meaning "This is the Sunnahof Allah and HisMessenger." (DE)
English reference (DE): Vol. 1, Book 5, Hadith 1176 (DE)
Arabic reference (DE): Book 5, Hadith 1232 (DE)