Sentence:  And He laid down for him certain conditions : so that , if he <WSD>kept</WSD> the command of God , then he would always remain as he was , that is , immortal ; but if he did not , he would become mortal , melting into earth , whence his frame had been taken '' . 
Meaning of the word marked with <WSD> tags:  behave as expected during of holidays or rites