9:81Those who stayed behind rejoiced at their staying behind the Messenger of God. And they hated to strive with their wealth and their lives in God’s way. And they said, “Do not venture out in the heat.” Say, “The Fire of Hell is much hotter, if they only understood.”

9:111God has purchased from the believers their lives and their properties in exchange for Paradise. They fight in God’s way, and they kill and get killed. It is a promise binding on Him in the Torah, and the Gospel, and the Quran. And who is more true to his promise than God? So rejoice in making such an exchange—that is the supreme triumph.

9:124Whenever a chapter is revealed, some of them say, “Which of you has this increased in faith?” As for those who believe: it increases them in faith, and they rejoice.