Aśauca-vidhi (Rules of Impurity) within Śrāddha-kalpa — Chapter on Testing/Selecting Brahmanas and Honoring the Atithi
चतुराश्रमबाह्येभ्य स्तेभ्यः श्राद्धे न दापयेत् / यस्तिष्ठेद्वायुभक्षश्च चातुराश्रमबाह्यतः
caturāśramabāhyebhya stebhyaḥ śrāddhe na dāpayet / yastiṣṭhedvāyubhakṣaśca cāturāśramabāhyataḥ
In śrāddha one should not give offerings to those outside the four āśramas; even one who lives as a ‘feeder on air’ (vāyubhakṣa), if outside the cāturāśrama, should not be given.