Shiva Purana
वत्सरादपि शिष्येण सो ऽन्यं गुरुमुपाश्रयेत् ॥ गुरुमन्यं प्रपन्ने ऽपि नावमन्येत पौर्विकम् ॥ गुरोर्भ्रात्ःंस्तथा पुत्रान्बोधकान्प्रेरकानपि ॥ ४७ ॥
After a year, the disciple should take refuge in another spiritual master. Even if one surrenders to another spiritual master, one should not despise his former spiritual master. The brothers of the spiritual master, sons, enlighteners and motivators.
english translation
vatsarAdapi ziSyeNa so 'nyaM gurumupAzrayet ॥ gurumanyaM prapanne 'pi nAvamanyeta paurvikam ॥ gurorbhrAtHMstathA putrAnbodhakAnprerakAnapi ॥ 47 ॥
hk transliteration by Sanscript