How authentic are the sayings circulating among Muslims, and do they have any basis in the Sunnah or among the Companions, such as the saying: "The grave calls out five times a day: 'I am the house of solitude, so make the recitation of the Holy Quran your companion'"?

It is narrated in Marfu’ (elevated) hadiths attributed to the Prophet, peace and blessings be upon him, that the grave speaks every day, saying: "I am the house of strangeness, I am the house of loneliness, I am the house of dust, and I am the house of worms." When a believer is buried, the grave says to him: "Welcome and اهلا (a greeting of welcome)," and it expands for him as far as his eye can see, and a door to Paradise is opened for him. But when a wicked person or a disbeliever is buried, the grave says to him: "No welcome and no اهلا," and it squeezes him until his ribs intertwine. This hadith is very weak.

It is reported from Ali ibn Abi Talib, may Allah be pleased with him, that the grave speaks three times every day, saying: "I am the house of darkness, I am the house of worms, I am the house of desolation." Beyond that is a fierce fire, or a Garden prepared for the pious.