Translation:

52. Send not away those who call on their Lord morning and evening seeking His Face. Naught have they to gain from thee and naught hast thou to gain from them that thou shouldst turn them away and thus be (one) of the unjust.

Notes (Tafseer)

870. Face: wajh: see ii. 112 and n. 114. "Face" is used for God's Grace or presence, the highest aim of spiritual aspiration.

871. Some of the rich and influential Quraish thought it beneath their dignity to listen to Muhammad's teaching in company with the lowly disciples, who were gathered round him. But he refused to send away these lowly disciples, who were sincere seekers after God. From a worldly point of view they had nothing to gain from Muhammad as he was himself poor and he had nothing to gain from them as they had no influence. But that was no reason for turning them away; indeed their true sincerity entitled them to precedence over wordly men in the kingdom of God, whose justice was vindicated in Muhammad's daily life in this as in other things. If their sincerity was in any way doubtful, it involved no reponsibility for the Preacher.