The Prophet ﷺ slaughtered two rams, black and white in color (as sacrifices), and I saw him putting his foot on their sides and mentioning Allah's Name and Takbir (Allahu Akbar). Then he slaughtered them with his own hands.  

ضَحَّى النَّبِيُّ ﷺ بِكَبْشَيْنِ أَمْلَحَيْنِ فَرَأَيْتُهُ وَاضِعًا قَدَمَهُ عَلَى صِفَاحِهِمَا يُسَمِّي وَيُكَبِّرُ فَذَبَحَهُمَا بِيَدِهِ