Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say the taslim between the two rakas and the one raka of witr so that he could order something he needed.
أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ يُسَلِّمُ بَيْنَ الرَّكْعَتَيْنِ وَالرَّكْعَةِ فِي الْوِتْرِ حَتَّى يَأْمُرَ بِبَعْضِ حَاجَتِهِ
Nafiʿ told that ʿAbdullah bin ʿUmar used to say Taslim between (the first) two Rakʿat and (the third) odd one in the Witr prayer, when he wanted to attend to a certain matter (during that interval between the Rakʿat).
أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ يُسَلِّمُ بَيْنَ الرَّكْعَةِ وَالرَّكْعَتَيْنِ فِي الْوِتْرِ حَتَّى يَأْمُرَ بِبَعْضِ حَاجَتِهِ