Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says about this saying of Allah Almighty, "La-'amruka": It means, by your life.
Abu Ya'la recorded it, and its chain is jayyid (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التفسير / 11108