ENOfficial
It was narrated from Sa'eed bin Al-Musayyib that: He disliked putting the dregs of Nabidh into (new) Nabidh lest it become strong because of the dregs.
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا سُوَيْدٌ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ مَعْمَرٍ، عَنْ قَتَادَةَ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ كَانَ يَكْرَهُ أَنْ يَجْعَلَ، نَطْلَ النَّبِيذِ فِي النَّبِيذِ لِيَشْتَدَّ بِالنَّطْلِ .
sunnah.com