Sahih Al Bukhari Hadith Number 991

Nafi` told that `Abdullah bin `Umar used to say Taslim between (the first) two Rak`at and (the third) odd one in the Witr prayer, when he wanted to attend to a certain matter (during that interval between the Rak`at).

14  Witr Prayer
Hadith number 991
Volume no 2
Chapter: 1 (What is said regarding the Witr prayer)