The Women - 4:58
Allah commands you to give the trust to its owners, and when you judge between people, judge with justice. How well Allah admonishes you. Allah is All-Hearing, All-Seeing.
The believers are trustworthy:
The Ways of Ascent/70:32
They are trustworthy, true to their word;
Prophet Joseph/12:54
"The king said: "Bring him, and I will appoint him to work for me."When he spoke to him, he said, "You are now a trustworthy man who has an important position with us today."
Prophet Joseph/12:55
"He said: "Put me in charge of the country´s finances. Surely I am a good guardian and a good judge."
The Believers/23:8
Those who take care of what has been entrusted to them. And they fulfill their promises.
The Family Of Imran/3:75
"Among the people of the Book is such that if you leave him a large trust, he will repay you in full. But there is one of them who, if you entrusted him with a Dinar, he would not pay it back unless you stood over him. This is because they say, "We have no responsibility towards the Ummis,"and they knowingly attribute their lies to Allah."