Acts 1:21

An Understandable Version (2005 edition)

The person [to replace Judas] would have to be one of those who accompanied us [disciples] during the time the Lord traveled around with us,

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[that is, people] who were ministers of the word and original eyewitnesses [of these events], and who passed them on to us; [and since]

So, they went in [i.e., into the cave-like tomb], but did not find the body of the Lord Jesus.