'Command' in the Bible

And Peter answering him said, Lord, if it be thou, command me to come to thee upon the waters.

They say to him, Why then did Moses command to give a letter of divorce and to send her away?

Command therefore that the sepulchre be secured until the third day, lest his disciples should come and steal him away, and say to the people, He is risen from the dead; and the last error shall be worse than the first.