Mukhtasar Bukhari (Abridged) 300 — Interlocking fingers in mosque

Narrated by Sayyiduna Abu Musa (may Allah be pleased with him) from the Noble Prophet (peace and blessings of Allah be upon him) that he (peace be upon him) said: "A believer to another believer is like a building, each part of which strengthens the other." And he (peace be upon him) interlaced his fingers.