"And if you turn away from them, seeking mercy from your Lord which you hope for," meaning: awaiting the provision of God. "Then speak to them a gentle word," meaning: that one should say to the seeker: May God provide for us and for you.
﴿وَإِمَّا تُعْرِضَنَّ عَنْهُمُ ابْتِغَاءَ رَحْمَةٍ من رَبك ترجوها﴾ يَعْنِي: انْتِظَارَ رِزْقِ اللَّهِ ﴿فَقُلْ لَهُم قولا ميسورا﴾ يَعْنِي: أَنْ يَقُولَ لِلسَّائِلِ: يَرْزُقُنَا الله وَإِيَّاك