meaning the one who undertakes to speak for them, takes the lead in doing so, and acts on their behalf.
Concerning the term kafīl (guarantor), Allah, Most High, says:
“While you have made Allah your guarantor.” [al-Nahl: 91]
The Messenger of Allah, may Allah bless him and grant him peace, said: “Allah has undertaken, for anyone who fights in His cause, leaving his home solely to fight in His cause and seek His pleasure, either to admit him to Paradise or to return him to the dwelling from which he set out, with whatever reward or spoils he has gained.”
He, may Allah bless him and grant him peace, also related: “A man from the Children of Israel asked another Israelite to lend him a thousand dinars. He said, ‘Bring me witnesses whom I can call upon to witness this.’ The man replied, ‘Allah is sufficient as a witness.’ He said, ‘Then bring me a guarantor.’ The man replied, ‘Allah is sufficient as a guarantor.’ He said, ‘You have spoken the truth,’ and handed him the money, to be repaid at an appointed time.
“The borrower set out to sea and attended to his business. He then sought a vessel to take him back to the lender by the appointed time, but could find none. So he took a piece of wood, hollowed it out, and placed inside it a thousand dinars and a letter from himself to the lender. Then he sealed the opening, brought it to the sea, and said, ‘O Allah, You know that I borrowed a thousand dinars from so-and-so. He asked me for a guarantor, and I said, “Allah is sufficient as a guarantor,” and he accepted You. He asked me for witnesses, and I said, “Allah is sufficient as a witness,” and he accepted You. I have striven to find a vessel by which to send him what he is owed, but have been unable to find one. I now entrust it to You.’ He cast it into the sea, and it disappeared into the water. Meanwhile, he continued looking for a vessel to take him back to his own land.
“The man who had lent him the money went out to see whether a vessel might have arrived with his money. There he found the piece of wood containing the money, and took it home to his family for firewood. When he sawed it open, he found the money and the letter.
“Then the borrower arrived, bringing a thousand dinars, and said, ‘By Allah, I have been striving all this time to find a vessel so that I could bring you