This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahi Fazail-e-Amaal.
Sayyiduna Abdullah bin Masood رضي الله عنهما narrates that the Prophet Muhammad صلی اللہ علیہ وسلم said: "Whoever lends a Muslim twice will be rewarded as if he has given charity once."
Reference: Sunan Ibn Majah, Book of Charity, Chapter on Loans, Hadith No: 2430. Mu'jam Kabir al-Tabarani: 9/335. Sahih Ibn Hibban (Al-Ihsan): 7/249.
Ibn Hibban has declared it authentic.