Srimad Bhagavatam Canto 05, Chapter 14, Text 29

SB 5.14.29

kadacid isvarasya bhagavato visnos cakrat paramanv-adi-dvi-parardhapavarga-kalopalaksanat parivartitena vayasa ramhasa harata abrahma-trna-stambadinam bhutanam animisato misatam vitrasta-hrdayas tam evesvaram kala-cakra-nijayudham saksad bhagavantam yajña-purusam anadrtya pakhanda-devatah kanka-grdhra-baka-vata-praya arya-samaya-parihrtah sanketyenabhidhatte.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The personal weapon used by Lord Krsna, the disc, is called hari-cakra, the disc of Hari. This cakra is the wheel of time. It expands from the beginning of the atoms up to the time of Brahma’s death, and it controls all activities. It is always revolving and spending the lives of the living entities, from Lord Brahma down to an insignificant blade of grass. Thus one changes from infancy, to childhood, to youth and maturity, and thus one approaches the end of life. It is impossible to check this wheel of time. This wheel is very exacting because it is the personal weapon of the Supreme Personality of Godhead. Sometimes the conditioned soul, fearing the approach of death, wants to worship someone who can save him from imminent danger. Yet he does not care for the Supreme Personality of Godhead, whose weapon is the indefatigable time factor. The conditioned soul instead takes shelter of a man-made god described in unauthorized scriptures. Such gods are like buzzards, vultures, herons and crows. Vedic scriptures do not refer to them. Imminent death is like the attack of a lion, and neither vultures, buzzards, crows nor herons can save one from such an attack. One who takes shelter of unauthorized man-made gods cannot be saved from the clutches of death.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
It is stated: harim vina mrtim na taranti. No one can save himself from the cruel hands of death without being favored by Hari, the Supreme Personality of Godhead. In Bhagavad-gita it is stated, mam eva ye prapadyante mayam etam taranti te: whoever fully surrenders unto Krsna can be saved from the cruel hands of material nature. The conditioned soul, however, sometimes wants to take shelter of a demigod, man-made god, pseudo incarnation or bogus svami or yogi. All these cheaters claim to follow religious principles, and all this has become very popular in this Age of Kali. There are many pasandis who, without referring to the sastras, pose themselves as incarnations, and foolish people follow them. Krsna, the Supreme Personality of Godhead, has left behind Him Srimad-Bhagavatam and Bhagavad-gita. Not referring to these authorized scriptures, rascals take shelter of man-made scriptures and try to compete with Lord Krsna. That is the greatest difficulty one encounters when trying to promote spiritual consciousness in human society. The Krsna consciousness movement is trying its best to bring people back to Krsna consciousness in its pure form, but the pasandis and atheists, who are cheaters, are so numerous that sometimes we become perplexed and wonder how to push this movement forward. In any case, we cannot accept the unauthorized ways of so-called incarnations, gods, cheaters and bluffers, who are described here as crows, vultures, buzzards and herons.
Srimad Bhagavatam Canto 05, Chapter 14, Text 28
Srimad Bhagavatam Canto 05, Chapter 14, Text 30