כִּֽי־אָ֭מַרְתִּי פֶּן־יִשְׂמְחוּ־לִ֑י בְּמ֥וֹט רַ֝גְלִ֗י עָלַ֥י הִגְדִּֽילוּ׃
For I said: 'Lest they rejoice over me; when my foot slippeth, they magnify themselves against me.'
Read midrashic interpretation of Psalms 38:17: and classical rabbinic exegesis.