next birth of human being so that we may again be able to learn the truth of Vedas and to get salvation. So one must always adopt true path by which he gets rebirth of human being to continue the real spiritualism to get salvation etc., because Atharvaveda mantra 9/10/16 further says that human being who has done pious deeds and adopted true path they get pious human body in the next birth, otherwise soul gets the lowest/contemptible body, like animals, birds etc.
Mantra is APAANG PRAANGETI SWDHAYAA GRIBHITAH AMARTYO MARTYENAA SAYONIHI. TA SHASHVANTA VISHUCHINA VIYANTA NYA NYAM CHIKYURN NI CHIKYURNYAM.
Soul according to its good or bad (APANGETI) takes bodies of animals, birds, insects etc., and (PRANG) bodies of Rishis, Munis, i.e., (uuch Yoni) best bodies after leaving the present body, the soul (SWDHAYAA GRIBHITAH) duly attached with its own power of taking birth according to pious deeds and sins, enters other bodies (AMARTAYAH) though the soul is away from death being immortal but after death of bodies, takes new bodies. These ideas of Vedas has very well been mentioned in Bhagwat Geeta shlok 2/20 wherein Yogeshwar Shri Krishna says (AJO NITYAH SHASHWATOAYAM PURAANNO NA HANYTE HANYAMANNE SHARIRE ) i.e., the soul is (AJAH NITAYAH SHASHWATOH) never takes birth and is eternal (NAHANYATE HANAYMANNE SHARIRE) in fact after death of body too soul is never dead being immortal. (TASHASHVANTA) this process of death and birth of bodies and souls is eternal.