The newly anointed king is handed a discipline before he is handed a crown. Wait seven days. Do not act until the one who ordains the sacrifice arrives. Authority proves itself first in the capacity to hold still, to submit to an order above your own impatience even when the pressure to move is unbearable.
The man who cannot wait cannot lead. Kingship rests on a prior obedience, on the willingness to let a higher pattern govern your timing rather than your fear. Saul is being tested at the root, in whether he can trust something beyond himself long enough to let it act. Power without that restraint destroys the one who holds it.