Did Peter fully enter the tomb? In Luke 24:12 it states that Peter stooped down to look through into the tomb, but omits any mention of hims actually going into the sepulchre itself. Only after he briefly stoops down does he run away from the location.

John 20:3–6 contrasts this by clearly saying that Peter fully entered the tomb and did not just stoop down to see from afar.

How would one reconcile these events?
Commentators who consider the Bible inerrant and attempt to resolve the apparent discrepancy agree that Luke is simply omitting details that John includes.  For example, James Burton Coffman writes:


  Here Luke abbreviated the whole incident so fully presented in John 20:1-9, omitting not only John's participation in it, but also, the fact of Peter's having actually entered the tomb. (source)


Adam Clarke says:


  This circumstance is related still more particularly by John, John 20:5-7. (source)


And, John Gill, commenting on the phrase "and went into the sepulchre" in John, sees no discrepancy:


  though not without first stooping down, as John did; see Luke 24:12. (source)