Manava Dharmashastra 11.37

11.37

narake hi patanty ete sa ca yasya tat
tasmād vaitānakuśalo hotā syād vedapāragaḥ //

For such (persons) offering a burnt-oblation sink into hell, as well as he to whom that (Agnihotra) belongs; hence the person who sacrifices (for another) must be skilled in (the performance of) Vaitana (rites), and know the whole Veda.