him, he claims that he could not have been processed as a balik-manggagawa as defined by law. We simply cannot countenance such trifling regard for the law by awarding to petitioner the money claims he is seeking in the present case.             As for the medical examination result which petitioner belatedly presented before the Court of Appeals, the law clearly requires that there should first be a job order relating to an existing overseas position before a worker shall be subjected to a medical examination.  In this case, as petitioner is the one insisting that a job order exists, he bears the burden of producing the same.  After all, the rule is settled that he who alleges must prove.[32]  Petitioner miserably failed to discharge this burden.             WHEREFORE, premises considered, the present petition is hereby DENIED and the Decision of the Court of Appeals dated28 November 2000 in CA-G.R. SP. No. 58795, affirming the Resolution of the National Labor Relations Commission dated 31 January 2000, is AFFIRMED.  No costs.             SO ORDERED.             MINITA V. CHICO-NAZARIO Associate Justice     WE CONCUR:     ARTEMIO V. PANGANIBAN Chief Justice Chairperson       CONSUELO YNARES-SANTIAGO     MA. ALICIA AUSTRIA-MARTINEZ                 Associate  Justice                                         Associate Justice