Muwatta Malik 1814
موطأ مالك#1814SahihThese are the words of a Successor — the generation after the Companions — not of the Prophet ﷺ.
وَحَدَّثَنِي مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ عِيسَى ابْنَ مَرْيَمَ، لَقِيَ خِنْزِيرًا بِالطَّرِيقِ فَقَالَ لَهُ انْفُذْ بِسَلاَمٍ . فَقِيلَ لَهُ تَقُولُ هَذَا لِخِنْزِيرٍ فَقَالَ عِيسَى إِنِّي أَخَافُ أَنْ أُعَوِّدَ لِسَانِي النُّطْقَ بِالسُّوءِ .
Malik related to me from Yahya ibn Said that Isa ibn Maryam encountered a pig on the road. He said to it, "Go in peace." Somebody asked, "Do you say this to a pig?" Isa said, "I fear lest I accustom my tongue to evil speech
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 56:4