Sayyiduna Jabir (may Allah be pleased with him) says: My father was buried along with another man, and because of this there was some unease in my heart. So I took him out after six months, and I found nothing changed in him except a few hairs of his beard that were in contact with the ground.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7077