It is narrated from Hazrat Abu Musa (may Allah be pleased with him) that once we were with the Prophet Muhammad (peace and blessings be upon him) on a journey of jihad. Whenever we ascended a hill or a high place or descended into a valley, we would say Takbeer in a loud voice. The Prophet Muhammad (peace and blessings be upon him) came close to us and said: O people! Be gentle with yourselves, you are not calling upon a deaf or absent Allah, you are calling upon the All-Hearing, the All-Seeing, who is closer to you than the neck of your mount. O Abdullah bin Qais, shall I not tell you about one of the treasures of Paradise? I said: Why not, O Messenger of Allah. He said: "La hawla wa la quwwata illa billah" (There is no power and no strength except with Allah) is one of the treasures of Paradise.
Hadith Referenceمسند احمد / تتمہ مُسْنَدِ الْكُوفِيِّينَ / 19599