Surat Al-'Isrā' - سورة الإسراء

وَإِمَّا تُعْرِضَنَّ عَنْهُمُ ابْتِغَاءَ رَحْمَةٍ مِّن رَّبِّكَ تَرْجُوهَا فَقُل لَّهُمْ قَوْلًا مَّيْسُورًا

Muhsin Khan: And if you (O Muhammad SAW) turn away from them (kindred, poor, wayfarer, etc. whom We have ordered you to give their rights, but if you have no money at the time they ask you for it) and you are awaiting a mercy from your Lord for which you hope, then, speak unto them a soft kind word (i.e. Allah will give me and I shall give you).