The Prophet (saw) said:
“The doers of justice will be on thrones of light at Allaah’s right Hand – and both of Allaah’s Hands are right Hands – those who were just in their rulings with their families, and in all that over which they were given authority.“
[Saheeh Muslim]
Allah says what can be translated as:
“Woe to Al-Mutaffififun (those who give less in measure and weight). Those who when they have to receive by measure from men demand full measure. And when they have to give by measure or weight to men give less than due. Do they not think that they will be resurrected (for reckoning). On a great day. The day when (all) mankind will stand before the Lord of the Alamin (all that exits).” [83:1-6]
Shaykh Ibn ‘Uthaymeen said concerning the explanation of Chapter Al-Mutaffinfin:
“Woe” The word woe is repeated in the Quran many times and according to what is most correct it is a statement of threat by which Allah threatens those whom oppose His command or indulge in what He has prohibited them from. And the prohibition is mentioned in the sentence following the threat.