Whence do I derive (the same for) theft and loss? It follows a fortiori, viz.: If a hired watcher, who is not liable for death, is liable for theft and loss, then a borrower, who is liable for death, how much more so should he be liable for theft and loss!
The Torah Establishes Different Levels of Responsibility for Different
Mekhilta Tractate Nezikin 16:23