Shiva Purana
तदाप्रभृति वै भ्राता भ्रातुरन्वेषणे रतः ॥ प्रयातो नश्यति मुने तन्न कार्य्यं विपश्चिता ॥ १३॥
Ever since, O sage, if a brother goes in quest of a brother he perishes. That should not be done by any learned man.
english translation
tadAprabhRti vai bhrAtA bhrAturanveSaNe rataH ॥ prayAto nazyati mune tanna kAryyaM vipazcitA ॥ 13॥
hk transliteration by Sanscript