'In an Instant' in the Bible

'And when the dead dieth beside him in an instant, suddenly, and he hath defiled the head of his separation, then he hath shaved his head in the day of his cleansing; on the seventh day he doth shave it,

'And if, in an instant, without enmity, he hath thrust him through, or hath cast at him any instrument, without lying in wait;