Muhammad bin Isma'il al-Bukhari said: I asked Qutaybah bin Sa'id: With whom did you write down, from al-Layth bin Sa'd, the hadith of Yazid bin Abi Habib from Abu al-Tufayl? He said: I wrote it down together with Khalid al-Mada'ini. Muhammad bin Isma'il said: This Khalid al-Mada'ini used to insert hadiths into the narrations of the shaykhs.
What they objected to in this is only the narration of Yazid bin Abi Habib from Abu al-Tufayl; as for the narration of Abu al-Zubayr from Abu al-Tufayl, it is mahfuz (preserved) and sahih (authentic).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5529