Tafsir of Yusuf 12:9

اقتلوا يوسف أو اطرحوه أرضا يخل لكم وجه أبيكم

Kill Yusuf or cast him out to some (other) land, so that the favor of your father may be given to you alone, They said, `Remove Yusuf, who competes with you for your father's love, from in front of your father's face so that his favor is yours alone. Either kill Yusuf or banish him to a distant land so that you are rid of his trouble and you alone enjoy the love of your father.'

وتكونوا من بعده قوما صالحين

and after that you will be righteous folk. thus intending repentance before committing the sin,