Garudapurana 2.25.24

2.25.24

ṛjudarbhaistilaiḥ śuklaiḥ prācīnāvīti niścitam /
apasavyaṃ ca kartavyaṃ kṛte yānti parāṃ gatim //

With straight darbha grass, white sesame seeds, the sacred thread worn over the right shoulder, / and made towards the south—when this is performed, they attain the supreme state.