Then We withdraw it towards Ourselves -- a gradual withdrawal.This refers to the shade.يَسِيرًا (gradual) meaning slowly.As-Suddi said:"A gentle, concealed, withdrawal until there is no shade left on earth except under a roof or a tree, and the sun is shining on whatever is above it."قَبْضًا يَسِيرًا (a gradual withdrawal).Ayub bin Musa said:"Little by little.