The Prophet ﷺ delivered the sermon, then descended and called for two rams, which he slaughtered.
حدثنا الحسن بن علي الخلال حدثنا أزهر بن سعد السمان عن ابن عون عن محمد بن سيرين
أن النبي ﷺ خطب ثم نزل فدعا بكبشين فذبحهما
No references are available.
Citation, Muslim also narrated it in Sahih Muslim, Qasamah wal-Muharibin, chapter on the gravity of the prohibition against violating lives, honor, and property, hadith no. 1679, from the hadith of Ibn Awn, transmitted at greater length.