Al-Adab Al-Mufrad, Hadith 336 ⓘ
Zayd ibn Aslam reported that his father heard 'Umar state, "Praise is slaughter." The transmitter added, "He meant when it is accepted."
حَدَّثَنَا مُحَمَّدٍ، قَالَ: حَدَّثَنَا عَبْدُ السَّلامِ، قَالَ: حَدَّثَنَا حَفْصٌ، عَنْ عُبَيْدِ اللهِ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ أَبِيهِ قَالَ: سَمِعْتُ عُمَرَ يَقُولُ: الْمَدْحُ ذَبْحٌ، قَالَ مُحَمَّدٌ: يَعْنِي إِذَا قَبِلَهَا.
also referenced under: Book 16, Hadith 4 (In-Book) & Book 16, Hadith 336 (English)