Kaushitakagrihyasutra 3.10.33

3.10.33

yadyasakṛtsaṃvatsarasya somena yajeta kṛtārghyā evainaṃ yājayeyuḥ \33\

If he should sacrifice with Soma more than once in a year, they should officiate for him only when the guest-offering has been performed for them;