《魏书·列传·卷八十一》
到后来元叉擅权执政，擅威弄权，侯刚的长子是元叉的妹夫，元叉就召侯刚为侍中、左卫将军，仍旧兼任尚食御典，以他作为亲党。
及领军元叉执政擅权，树结亲党，刚长子，叉之妹夫，乃引刚为侍中、左卫将军，还领尚食典御，以为枝援。
Later, Yuan Cha assumed power and made arbitrary decisions. Hou Gang’s eldest son was Yuan Cha’s brother-in-law, so Yuan Cha summoned Hou Gang to serve as Imperial Advisor and Left Guards General, and gave him the additional title of Imperial Food Supervisor, placing him in one of his party.