SB 11.17.29

śuśrūṣamāṇa ācāryaṁ
 sadopāsīta nīca-vat
yāna-śayyāsana-sthānair
 nāti-dūre kṛtāñjaliḥ
Synonyms: 
śuśrūṣamāṇaḥ — engaged in serving; ācāryam — the bona fide spiritual master; sadā — always; upāsīta — one should worship; nīca-vat — as a humble servant; yāna — by humbly following behind the guru when he is walking; śayyā — by taking rest with the spiritual master; āsana — sitting near the guru to render service; sthānaiḥ — by standing and humbly waiting upon the guru; na — not; ati — very; dūre — far away; kṛta-añjaliḥ — with folded hands.
Translation: 
While engaged in serving the spiritual master one should remain as a humble servant, and thus when the guru is walking the servant should humbly walk behind. When the guru lies down to sleep, the servant should also lie down nearby, and when the guru has awakened, the servant should sit near him, massaging his lotus feet and rendering other, similar services. When the guru is sitting down on his āsana, the servant should stand nearby with folded hands, awaiting the guru’s order. In this way one should always worship the spiritual master.