"obliged, be under obligation"

"John 13:14-17 

If I then, your Lord and Master, have washed your feet; you also Ought to wash one another’s feet. 

For I have given you an example, that you should do as I have done to you.  

Verily, verily, I say unto you, The servant is not greater than his lord; neither he that is sent greater than he that sent him. If you know these things, happy are you if you do them. 

The word “ought” in this Scripture is from the Greek ofeilo, and, according to Greenfield, means, …to be bound to the performance of some duty, be obliged, be under obligation." 

M.E. Cornell