he fully practises what he preaches
1practise what you preach — 1377 LANGLAND Piers Plowman B. XIII. 79 This goddes gloton..Hath no pyte on vs pore. He perforneth yuel [does evil], That he precheth he preueth [demonstrates] nought. 1639 T. FULLER Holy War I. xxiii. The Levites..had 48 cities..being better… …
