Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
nasai-kubra:6733Abū Bakr b. Nāfiʿ > Bahz > Ibn Asad > Ḥammād b. Salamah > Thābit > Anas

[Machine] The Messenger of Allah ﷺ commanded us to clean the plate because you do not know in which food the blessing lies.  

الكبرى للنسائي:٦٧٣٣أَخْبَرَنَا أَبُو بَكْرِ بْنُ نَافِعٍ قَالَ حَدَّثَنَا بَهْزٌ هُوَ ابْنُ أَسَدٍ قَالَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ قَالَ حَدَّثَنَا ثَابِتٌ عَنْ أَنَسٍ قَالَ

إِنَّ رَسُولَ اللهِ ﷺ «أَمَرَنَا أَنْ نَسْلُتَ الْقَصْعَةَ فَإِنَّكُمْ لَا تَدْرُونَ فِي أَيِّ طَعَامِكُمُ الْبَرَكَةُ»