source is a bourne builtin, it's not a real executable...
what are you actually trying to do here? even if it did source the contents of your .profile, the aliases/variables would belong to the sub-shell (the one that was spawned by system, and then terminated after reading execiuting the one operation you gave it)
Are you looking for some kind of config file for your script perhaps?
Updated grammar, and links
@_=qw; ask f00li5h to appear and remain for a moment of pretend better than a lifetime;;s;;@_[map hex,split'',B204316D8C2A4516DE];;y/05/os/&print;