Shiva Purana

siva.sh/siva-purana/uma-samhita/28/13

वत्सरे विगते मंत्री तन्नास्ति यन्न साधयेत् ।। अणिमादिगुणानष्टौ खेचरत्वं प्रपद्यते ।। १३।।

sanskrit

If a year passes by there will be nothing that the repeater of the mantra cannot achieve. He attains the eight Siddhis, Aṇimā and others and the ability to walk through the sky.

english translation

vatsare vigate maMtrI tannAsti yanna sAdhayet || aNimAdiguNAnaSTau khecaratvaM prapadyate || 13||

hk transliteration by Sanscript