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bayhaqi:4531Mālik > Hishām b. ʿUrwah from his father > ʿAbdullāh b. Masʿūd > Mā Ubālī Law Uqīmat al-Ṣalāh

[Machine] It does not matter to me if the prayer is established while I am performing the Witr prayer.  

البيهقي:٤٥٣١وَبِإِسْنَادِهِ قَالَ ثنا مَالِكٌ عَنْ هِشَامِ بْنِ عُرْوَةَ عَنْ أَبِيهِ أَنَّ عَبْدَ اللهِ بْنَ مَسْعُودٍ قَالَ

مَا أُبَالِي لَوْ أُقِيمَتِ الصَّلَاةُ وَأَنَا أَوتِرُ