To the debtor when the debt is settled

Bārakallāhu laka fī ahlika wa mālik, innamā jazā'us-salafi ‘l-ḥamdu wa‘l-adā'.

May Allah bless you in your family and your wealth, surely the reward for a loan is praise and returning (what was borrowed).

[ An-Nasa'i, 'Amalul-Yawm wal-Laylahp. 300, Ibn Majah 2/809. See also Al-Albani, Sahih Ibn Majah2/55. Hisn al-Muslim 202 ]