(The basic rule governing transactions is that they are lawful and valid unless there is evidence establishing their prohibition or invalidity.) This is part of Allah’s blessing: the path leading to Allah—that is, acts of worship—the basic rule concerning it is prohibition, unless evidence establishes that it has been legislated. As for transactions between people, it is from Allah’s mercy and His making matters easy for His servants that their basic rule is permissibility and lawfulness, except where evidence has come prohibiting them. Accordingly, we say: What prevents a debt from being secured by another debt?! So long as it involves neither injustice, uncertainty, nor usury, the basic rule is that it is valid.
A pledge is one of the contracts of security, and contracts of security are of three types: witnessing, pledging, and guaranteeing, which also includes suretyship.
All of these are mentioned in the Quran. As for witnessing, Allah Most High says: “And take witnesses when you enter into a transaction.” [al-Baqarah 2:282] As for pledging, He says: “Then let there be a pledged security in hand.” [al-Baqarah 2:283] As for guaranteeing and suretyship, He says: “Whoever brings it shall have a camel-load, and I guarantee it.” [Yusuf 12:72] That is, I am its surety and guarantor. Through these three means, the holder of a right secures his right. Therefore, it is negligence to deal with someone without witnesses, a pledge, or a guarantee.
His statement, “It is valid with respect to every tangible asset that may be sold”: the author has explained what may validly be pledged, and from this we may also derive the ruling concerning pledges.
As we have said, the basic rule concerning pledges is validity. Its evidence is found in the Book of Allah, the sunnah of the Messenger of Allah, peace and blessings be upon him, scholarly consensus, and sound reasoning. Thus, its evidences are four:
As for the Book, Allah Most High says: “And if you are on a journey and cannot find a scribe, then let there be a pledged security in hand.” [al-Baqarah 2:283]
As for the sunnah, the Prophet, peace and blessings be upon him, said: “A riding animal may be ridden in return for its maintenance when it is…”