Muwatta Malik:Tahajjud:Hadith 282
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ، أَنَّهُ قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عَامِرِ بْنِ رَبِيعَةَ، يَقُولُ إِنِّي لأُوتِرُ وَأَنَا أَسْمَعُ الإِقَامَةَ، أَوْ بَعْدَ الْفَجْرِ ‏.‏ يَشُكُّ عَبْدُ الرَّحْمَنِ أَىَّ ذَلِكَ قَالَ ‏.‏

Yahya related to me from Malik that Abd ar-Rahman ibn al-Qasim said, “I heard Abdullah ibn Amir ibn Rabia say, ‘I sometimes pray witr while hearing the iqama, or after the break of dawn.’ ” Abd ar-Rahman was not certain which he said.