Sahih Al Bukhari Hadith Number 823

Narrated Malik bin Huwairith Al-Laithi: I saw the Prophet (peace be upon him) praying and in the odd rak`at, he used to sit for a moment before getting up.

10  Call to Prayers (Adhaan)
Hadith number 823
Volume no 1
Chapter: 142 (Sitting Straight in a Witr payer (i.e., an odd Rak’a) and then getting up.)