It is narrated from Hazrat Nawas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Allah has given an example that there is a straight path, on both sides of which are walls, and in these walls are open doors, with curtains hanging over the doors. At the main gate of the path, a caller is standing and calling out, and another caller is calling from above it. Allah invites to the house of peace and guides whom He wills to the straight path.
Hadith Referenceمسند احمد / مسند الشاميين / 17636
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف، بقية يدلس تدليس التسوية، ولم يصرح بالسماع فى جميع طبقات السند