In a 1951 letter, the Rebbe urges Agudas Chassidei Chabad in Eretz HaKodesh to support a dedicated individual, emphasizing the Previous Rebbe’s appreciation for his efforts. While confident they recognize the need, the Rebbe stresses that even the diligent benefit from encouragement and asks them to assist appropriately.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/shevat/887