In Chapter 40, Poem 13 of Attar's Mokhtar Nameh, the poet employs the metaphor of the beloved as an assayer (ناقد) of lovers. The lover's face, pale from suffering, is likened to gold (زر) being evaluated for its purity. The poem culminates in a plea for the beloved's attention, beautifully framed as the 'alms of the eye' (زکات چشم)—a metaphorical charity or tax on the beloved's beauty and sight, paid by casting a merciful glance upon the suffering lover.