Quoting_commentary for Psalms 18:26

עִם־חָסִ֥יד תִּתְחַסָּ֑ד עִם־גְּבַ֥ר תָּ֝מִ֗ים תִּתַּמָּֽם׃

With the merciful Thou dost show Thyself merciful, with the upright man Thou dost show Thyself upright;