Manusmriti
विद्ययैव समं कामं मर्तव्यं ब्रह्मवादिना । आपद्यपि हि घोरायां न त्वेनामिरिणे वपेत् ॥ ११३ ॥
Even in times of dire distress a teacher of the Veda should rather die with his knowledge than sow it in barren soil.
english translation
vidyayaiva samaM kAmaM martavyaM brahmavAdinA । Apadyapi hi ghorAyAM na tvenAmiriNe vapet ॥ 113 ॥
hk transliteration by Sanscript