The reflexive pronoun "myself" is used here to emphasize that Jesus lays down his own life. No one takes it from him. Alternate translation: "I myself lay it down" (See: [[rc://en/ta/man/jit/figs-rpronouns]])
"This is what my Father has commanded me to do." The word "Father" is an important title for God. (See: [[rc://en/ta/man/translate/guidelines-sonofgodprinciples]])