Reference for Yevamot 31:5
תפסו לרבי יהושע והושיבהו על מטה של זהב א"ל רבי אמור לתלמידך אחר וישב אמר לו מי הוא רבי אלעזר בן עזריה אמר ויש לו בן לעזריה חבירנו
When a discussion took place as to who should go and communicate with him, R. Joshua said to them, 'I will go'. 'And who after him?' — 'R. Eleazar b. Azariah.' 'And who after him?' — 'R. Akiba'. They went and stood at the entrance of his house. His maid entered and told him, 'Master, the Sages of Israel are come to you'. 'Let them enter', he said to her; and they entered. Taking hold of R. Joshua he made him sit upon a golden couch. The latter said to him, 'Master, will you ask your other disciple to sit down'? 'Who is he?' [the Master] enquired. — 'R. Eleazar b. Azariah'. 'Has our friend Azariah a son?' [the Master] exclaimed, and applied to him this Scriptural text, I have been young and now I am old; yet have I not seen the righteous forsaken, nor his seed begging bread;<span class="x" onmousemove="('comment',' Ps. XXXVII, 25. ');"><sup>8</sup></span> and so took hold of him also and made him sit upon a golden couch. 'Master', said he,<span class="x" onmousemove="('comment',' R. Joshua. ');"><sup>9</sup></span>