We learn in our Parsha (Shemot 28,29):
וְנָשָׂ֣א אַֽ֠הֲרֹ֠ן אֶת־שְׁמ֨וֹת בְּנֵֽי־יִשְׂרָאֵ֜ל בְּח֧שֶׁן הַמִּשְׁפָּ֛ט עַל־לִבּ֖וֹ בְּבֹא֣וֹ אֶל־הַקֹּ֑דֶשׁ לְזִכָּרֹ֥ן לִפְנֵֽי־יְהֹוָ֖ה תָּמִֽיד
"Aaron shall carry the names of the sons of Israel on the breastpiece of decision over his heart, when he enters the sanctuary, for remembrance before G'd at all times."
A Rov, a leader has to always carry (the names of) Bnei Yisroel – on his heart !
The story is told of the student who learned in Ponevezh Yeshiva, who's little son was taken ill and needed urgent surgery in Tel Aviv hospital. The student went to the Ponevezh Rov and asked for a Brocho, for his blessing.
Next day, the operation went well and the little child was recovering – the student went over to tell the Rov good news.
He found the Rov sitting in his room with Tehillim, the Book of Psalms, red eyed – he was crying in Tefillah for the little son of one of his many students.
A real Rov (indeed – any real friend) has his friends/students – on his heart always.
Shabbat Shalom and best wishes
Rabbi Chaim Michael Biberfeld