Hesitation is mentioned in the Quran in these verses:
[4:65] Never indeed, by your Lord; they are not believers unless they come to you to judge in their disputes, then find no hesitation in their hearts whatsoever in accepting your judgment. They must submit a total submission.
[33:14] Had the enemy invaded and asked them to join, they would have joined the enemy without hesitation.
[59:9] As for those who provided them with a home and a refuge, and were believers before them, they love those who immigrated to them, and find no hesitation in their hearts in helping them. In fact, they readily give them priority over themselves, even when they themselves need what they give away. Indeed, those who overcome their natural stinginess are the successful ones.
To learn more, read the Quran in English.
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