The foot washing has always been a little strange and a little weird to the people called church. For one, only John includes it and, for another, it reveals the heart of God in a way that feels uncomfortable.
Not only does Jesus, God in the flesh, get down on his knees to wash the dirty feet of the disciples, one of whom will shortly betray him, another will deny him, and the rest will leave him hanging to die on a cross, but then Jesus has the gall to command us to do the same for one another.
And yet, in a way, more than being told what we are supposed to do, the whole message of this final moment is, again, about what Jesus does *for us*.