We're told why in Hebrews 11:4: "By faith Abel offered to God a better sacrifice than Cain, through which he obtained the testimony that he was righteous, God testifying about his gifts, and through faith, though he is dead, he still speaks."
Avele: Hev 11:4 Hi ku pfumela, Avele ú humesele Xikwembu magandzelo lama amukelekeke ku tlula ya Kayini, kutani hikwalaho ka swona ú nkhensiwile a vuriwa loyi a lulameke, Xikwembu xi ri karhi xi tiyisa sweswo hi ku amukela tinyiko ta yena.