مَنْ دَلَّ عَلَى خَيْرٍ، فَلَهُ مِثْلُ أَجْرِ فَاعِلِهِ
Whoever guides someone to a good deed receives a reward like that of its doer.
Source: مسلم
دَلَّ عَلَى means “to direct or guide toward.” The phrase فَلَهُ begins the response to the condition. مِثْلُ أَجْرِ فَاعِلِهِ means “a reward like that of the one who does it”; فَاعِل is an active participle, “the doer.” This construction links beneficial guidance with reward.
Helping someone find a reliable way to do good is itself valuable. One may direct others to useful learning, appropriate assistance, or an opportunity for service. The message is about responsible guidance; passing on unverified or harmful advice should not be confused with directing someone toward good.