Verse 19

إِن تَسْتَفْتِحُوا۟ فَقَدْ جَآءَكُمُ ٱلْفَتْحُ وَإِن تَنتَهُوا۟ فَهُوَ خَيْرٌ لَّكُمْ وَإِن تَعُودُوا۟ نَعُدْ وَلَن تُغْنِىَ عَنكُمْ فِئَتُكُمْ شَيْـًٔا وَلَوْ كَثُرَتْ وَأَنَّ ٱللَّهَ مَعَ ٱلْمُؤْمِنِينَ

If you seek victory, surely you will gain victory, however, if you refrain, it is better for you, and if you return, we will also return and your number does not benefit you in the least no matter how great and remember that God is with the faithful.