«وَلَا أُعْطِي زِمَامِي مَنْ يُخْفِرُ ذِمَامِي»
I will not hand over my reins to someone who violates my trust and protection.
Zimām is a rein for controlling an animal; it pictures personal agency and decisions. Dhimām means pledge, protection, or obligation. Yukhfiru describes violating that protection or trust.
The single-consonant contrast, zimām/dhimām, creates partial jinās. The rhetorical point is concise: do not surrender control to someone unworthy of confidence.