शुचौ देशे प्रतिष्ठाप्य स्थिरमासनमात्मनः। नात्युच्छ्रितं नातिनीचं चैलाजिनकुशोत्तरम्
śhuchau deśhe pratiṣhṭhāpya sthiram āsanam ātmanaḥ nātyuchchhritaṁ nāti-nīchaṁ chailājina-kuśhottaram
Having chosen a holy place, let him sit in a firm posture on a seat that is neither too high nor too low, and cover it with a grass mat, a deer skin, and a cloth.
Translated by Shri Purohit Swami
In a clean spot, having established a firm seat of his own, neither too high nor too low, made of cloth, skin, and kusha grass layered one over the other.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
śhuchau—in a clean; deśhe—place; pratiṣhṭhāpya—having established; sthiram—steadfast; āsanam—seat; ātmanaḥ—his own; na—not; ati—too; uchchhritam—high; na—not; ati—too; nīcham—low; chaila—cloth; ajina—a deerskin; kuśha—kuśh grass; uttaram—one over the other