Consecrate yourselves: Self-purification involved bathing and avoiding sexual activity (see Exodus 19:10–15; compare Genesis 35:2–4).
The sacrifice probably happened the next morning (see Numbers 11:18; Joshua 3:5; 7:13–14).
Samuel conducted the purification ritual for Jesse and his sons to prepare them for the sacrifice and the anointing of the new king (compare Exodus 19:10; Joshua 3:5).