Is this legal in football?

I was lined up on a receiver at the line of scrimmage and when the ball was snapped I put my hand on him because I know as usual Im allowed to make contact with the receiver within 5 yards of the LOS, the receiver then grabbed me more towards my backside and threw me, it was a pass play so I slipped up and he got... show more I was lined up on a receiver at the line of scrimmage and when the ball was snapped I put my hand on him because I know as usual Im allowed to make contact with the receiver within 5 yards of the LOS, the receiver then grabbed me more towards my backside and threw me, it was a pass play so I slipped up and he got past me and got open but thankfully it wasnt thrown to him, is he allowed to do that?
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