"Then We withdrew it to Us," meaning: the shadow, "a gradual withdrawal," meaning: easy for Us.
﴿ثمَّ قبضناه﴾ يَعْنِي: الْظِلَّ ﴿إِلَيْنَا قَبْضًا يَسِيرًا﴾ أَي: يَسِيرا علينا