Yusuf Ali
Those who reject Faith say: "Why is not the Qur´an revealed to him all at once? Thus (is it revealed), that We may strengthen thy heart thereby, and We have rehearsed it to thee in slow, well-arranged stages, gradually.

Sahih International
And those who disbelieve say, "Why was the Qur'an not revealed to him all at once?" Thus [it is] that We may strengthen thereby your heart. And We have spaced it distinctly.

Shakir
And those who disbelieve say: Why has not the Quran been revealed to him all at once? Thus, that We may strengthen your heart by it and We have arranged it well in arranging.

Pickthall
And those who disbelieve say: Why is the Qur´an not revealed unto him all at once? (It is revealed) thus that We may strengthen thy heart therewith; and We have arranged it in right order.

محمد جالندھری
اور کافر کہتے ہیں کہ اس پر قرآن ایک ہی دفعہ کیوں نہیں اُتارا گیا۔ اس طرح (آہستہ آہستہ) اس لئے اُتارا گیا کہ اس سے تمہارے دل کو قائم رکھیں۔ اور اسی واسطے ہم اس کو ٹھہر ٹھہر کر پڑھتے رہے ہیں